Toolbox mvnsh integration (#151)

Integrate Toolbox into mvnsh.

Example:
https://gist.github.com/cstamas/81b150e3f4b8347f0610779f4f230421

Use it as following entry in `.mvn/extensions.xml`:
```xml
<?xml version="1.0" encoding="UTF-8"?>
<extensions>
    <extension>
        <groupId>eu.maveniverse.maven.toolbox</groupId>
        <artifactId>mvnsh</artifactId>
        <version>0.6.2-SNAPSHOT</version>
    </extension>
</extensions>
```

Needs Maven 4.0.0-rc-3+

Author: cstamas

.github/workflows/ci.yml

@@ -12,5 +12,5 @@ jobs:
     uses: maveniverse/parent/.github/workflows/ci.yml@release-26
     with:
       jdk-matrix: '[ "11", "21" ]'
-      maven-test: './mvnw clean verify -e -B -V -P run-its -rf :it'
+      maven-test: './mvnw clean verify -e -B -V -P run-its -f it'
 

it/toolbox-plugin-its/src/it/plugin-versions/my-repo/org/maveniverse/maven/toolbox/it/versions/first/maven-metadata.xml

@@ -1,4 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2023-2024 Maveniverse Org.
+    All rights reserved. This program and the accompanying materials
+    are made available under the terms of the Eclipse Public License v2.0
+    which accompanies this distribution, and is available at
+    https://www.eclipse.org/legal/epl-v20.html
+
+-->
 <metadata>
   <groupId>org.maveniverse.maven.toolbox.it.versions</groupId>
   <artifactId>first</artifactId>

it/toolbox-plugin-its/src/it/plugin-versions/my-repo/org/maveniverse/maven/toolbox/it/versions/fourth/maven-metadata.xml

@@ -1,4 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2023-2024 Maveniverse Org.
+    All rights reserved. This program and the accompanying materials
+    are made available under the terms of the Eclipse Public License v2.0
+    which accompanies this distribution, and is available at
+    https://www.eclipse.org/legal/epl-v20.html
+
+-->
 <metadata>
   <groupId>org.maveniverse.maven.toolbox.it.versions</groupId>
   <artifactId>fourth</artifactId>

it/toolbox-plugin-its/src/it/plugin-versions/my-repo/org/maveniverse/maven/toolbox/it/versions/second/maven-metadata.xml

@@ -1,4 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2023-2024 Maveniverse Org.
+    All rights reserved. This program and the accompanying materials
+    are made available under the terms of the Eclipse Public License v2.0
+    which accompanies this distribution, and is available at
+    https://www.eclipse.org/legal/epl-v20.html
+
+-->
 <metadata>
   <groupId>org.maveniverse.maven.toolbox.it.versions</groupId>
   <artifactId>second</artifactId>

it/toolbox-plugin-its/src/it/plugin-versions/my-repo/org/maveniverse/maven/toolbox/it/versions/third/maven-metadata.xml

@@ -1,4 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2023-2024 Maveniverse Org.
+    All rights reserved. This program and the accompanying materials
+    are made available under the terms of the Eclipse Public License v2.0
+    which accompanies this distribution, and is available at
+    https://www.eclipse.org/legal/epl-v20.html
+
+-->
 <metadata>
   <groupId>org.maveniverse.maven.toolbox.it.versions</groupId>
   <artifactId>third</artifactId>

it/toolbox-plugin-its/src/it/versions/my-repo/org/maveniverse/maven/toolbox/it/versions/first/maven-metadata.xml

@@ -1,4 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2023-2024 Maveniverse Org.
+    All rights reserved. This program and the accompanying materials
+    are made available under the terms of the Eclipse Public License v2.0
+    which accompanies this distribution, and is available at
+    https://www.eclipse.org/legal/epl-v20.html
+
+-->
 <metadata>
   <groupId>org.maveniverse.maven.toolbox.it.versions</groupId>
   <artifactId>first</artifactId>

it/toolbox-plugin-its/src/it/versions/my-repo/org/maveniverse/maven/toolbox/it/versions/fourth/maven-metadata.xml

@@ -1,4 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2023-2024 Maveniverse Org.
+    All rights reserved. This program and the accompanying materials
+    are made available under the terms of the Eclipse Public License v2.0
+    which accompanies this distribution, and is available at
+    https://www.eclipse.org/legal/epl-v20.html
+
+-->
 <metadata>
   <groupId>org.maveniverse.maven.toolbox.it.versions</groupId>
   <artifactId>fourth</artifactId>

it/toolbox-plugin-its/src/it/versions/my-repo/org/maveniverse/maven/toolbox/it/versions/second/maven-metadata.xml

@@ -1,4 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2023-2024 Maveniverse Org.
+    All rights reserved. This program and the accompanying materials
+    are made available under the terms of the Eclipse Public License v2.0
+    which accompanies this distribution, and is available at
+    https://www.eclipse.org/legal/epl-v20.html
+
+-->
 <metadata>
   <groupId>org.maveniverse.maven.toolbox.it.versions</groupId>
   <artifactId>second</artifactId>

it/toolbox-plugin-its/src/it/versions/my-repo/org/maveniverse/maven/toolbox/it/versions/third/maven-metadata.xml

@@ -1,4 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2023-2024 Maveniverse Org.
+    All rights reserved. This program and the accompanying materials
+    are made available under the terms of the Eclipse Public License v2.0
+    which accompanies this distribution, and is available at
+    https://www.eclipse.org/legal/epl-v20.html
+
+-->
 <metadata>
   <groupId>org.maveniverse.maven.toolbox.it.versions</groupId>
   <artifactId>third</artifactId>

mvnsh/pom.xml

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2023-2024 Maveniverse Org.
+    All rights reserved. This program and the accompanying materials
+    are made available under the terms of the Eclipse Public License v2.0
+    which accompanies this distribution, and is available at
+    https://www.eclipse.org/legal/epl-v20.html
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>eu.maveniverse.maven.toolbox</groupId>
+    <artifactId>toolbox</artifactId>
+    <version>0.6.5-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>mvnsh</artifactId>
+
+  <name>${project.groupId}:${project.artifactId}</name>
+
+  <properties>
+    <!-- Aligned with Maven 4 -->
+    <maven.compiler.release>17</maven.compiler.release>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-cli</artifactId>
+      <version>4.0.0-rc-3</version>
+      <scope>provided</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>eu.maveniverse.maven.plugins</groupId>
+      <artifactId>toolbox</artifactId>
+      <exclusions>
+        <exclusion>
+          <groupId>org.jline</groupId>
+          <artifactId>jline</artifactId>
+        </exclusion>
+        <exclusion>
+          <groupId>org.slf4j</groupId>
+          <artifactId>slf4j-api</artifactId>
+        </exclusion>
+        <exclusion>
+          <groupId>org.slf4j</groupId>
+          <artifactId>jcl-over-slf4j</artifactId>
+        </exclusion>
+        <exclusion>
+          <groupId>eu.maveniverse.maven.mima.runtime</groupId>
+          <artifactId>embedded-maven</artifactId>
+        </exclusion>
+      </exclusions>
+    </dependency>
+    <dependency>
+      <groupId>eu.maveniverse.maven.mima.runtime</groupId>
+      <artifactId>standalone-static-uber</artifactId>
+    </dependency>
+  </dependencies>
+
+</project>