Adds java gurobi knapsack example

[merschformann]

Description

Adds an example project using Gurobi Maven package directly for modeling a simple knapsack problem.

Changes

• Adds java-gurobi-knapsack app.
  • Implemented in Java using Maven.
  • Uses com.gurobi.gurobi Maven package.
  • Uses the knapsack problem as an example.
• Fixes small readme issues in other java apps.
• Fixes a severe bug in java OR-Tools example.
  • Output was messed up and it did not read capacity correctly.

[Copilot]

Pull Request Overview

This pull request adds a new Java example project for solving a knapsack problem using the Gurobi Maven package. Key changes include:

• A new application (java-gurobi-knapsack) implementing the knapsack problem.
• Updates to README files in existing Java apps to correctly reference the new Java source paths.
• Supporting changes in Maven configuration, workspace files, and test scripts.

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
java-ortools-routing/README.md	Updated to reference the Java main class instead of main.py.
java-ortools-knapsack/README.md	Updated to reference the Java main class instead of main.py.
java-gurobi-knapsack/src/main/java/com/nextmv/example/Output.java	New output class implementation with nested classes.
java-gurobi-knapsack/src/main/java/com/nextmv/example/Options.java	New options parsing code for the Gurobi knapsack example.
java-gurobi-knapsack/src/main/java/com/nextmv/example/Main.java	Main program implementation for the knapsack solver.
java-gurobi-knapsack/src/main/java/com/nextmv/example/Item.java	New Item class to represent knapsack items.
java-gurobi-knapsack/src/main/java/com/nextmv/example/Input.java	New input parsing class using Gson for JSON input.
java-gurobi-knapsack/pom.xml	Maven configuration for building the Java Gurobi example.
Other files (code-workspace, input.json, app.yaml, README.md, LICENSE, devcontainer, and workflow files)	Supporting configurations and documentation for development and CI.