OpenRewrite recipe best practices (#1059)

* OpenRewrite recipe best practices

Use this link to re-run the recipe: https://app.moderne.io/recipes/org.openrewrite.recipes.rewrite.OpenRewriteRecipeBestPractices?organizationId=QUxML09wZW4gU291cmNlL09wZW5SZXdyaXRl

Co-authored-by: Moderne <team@moderne.io>

* Apply suggestions from code review

---------

Co-authored-by: Moderne <team@moderne.io>

Author: timtebeek

src/main/java/org/openrewrite/maven/ConfigurableRewriteMojo.java

@@ -35,7 +35,9 @@
 import java.nio.file.Paths;
 import java.util.*;
 
-import static java.util.Collections.*;
+import static java.util.Collections.emptyMap;
+import static java.util.Collections.emptySet;
+import static java.util.Collections.unmodifiableSet;
 import static java.util.stream.Collectors.toCollection;
 import static org.openrewrite.java.style.CheckstyleConfigLoader.loadCheckstyleConfig;
 

src/main/java/org/openrewrite/maven/MavenMojoProjectParser.java

@@ -82,8 +82,13 @@
 import java.util.function.UnaryOperator;
 import java.util.stream.Stream;
 
-import static java.util.Collections.*;
-import static java.util.stream.Collectors.*;
+import static java.util.Collections.emptyList;
+import static java.util.Collections.emptyMap;
+import static java.util.Collections.singletonList;
+import static java.util.Collections.singletonMap;
+import static java.util.stream.Collectors.toList;
+import static java.util.stream.Collectors.toMap;
+import static java.util.stream.Collectors.toSet;
 import static org.openrewrite.PathUtils.separatorsToUnix;
 import static org.openrewrite.Tree.randomId;
 import static org.openrewrite.maven.MavenMojoProjectParser.MavenScope.MAIN;