Add Maven Wrapper cache feature

[mahabaleshwars]

Description:
Add Maven Wrapper distribution caching support

Related issue:
#448

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

Adds Maven Wrapper distribution caching to the existing cache: maven behavior in actions/setup-java, aligning Maven with the already-supported Gradle wrapper distribution caching approach. This reduces repeated Maven distribution downloads for projects using the official Maven Wrapper.

Changes:

• Extend Maven cache paths to include ~/.m2/wrapper/dists (Maven Wrapper distributions) in addition to ~/.m2/repository.
• Include **/.mvn/wrapper/maven-wrapper.properties in the default Maven cache key hash inputs (alongside **/pom.xml).
• Update documentation and tests to reflect the new Maven cache inputs/paths.

Reviewed changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/cache.ts	Adds Maven Wrapper distribution directory to cached paths and wrapper properties file to the hash pattern list.
README.md	Documents the updated Maven cache key inputs to include maven-wrapper.properties.
dist/setup/index.js	Updates the bundled action output to match the new Maven cache paths/patterns.
dist/cleanup/index.js	Updates the bundled post action output to match the new Maven cache paths/patterns.
tests/cache.test.ts	Expands Maven cache tests to cover hashing with wrapper properties and restoring both cache paths.

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