Add CI Pipeline with Maven Wrapper and Update Build Instructions

[dariuszzbyrad]

This PR introduces the following improvements to streamline the build and testing process:

1. Continuous Integration (CI) with GitHub Actions:

   • Added a CI workflow (Maven CI) to automatically build and test the project.
   • The CI workflow triggers on pushes and pull requests targeting the master branch, ensuring that only production-ready changes are verified before merging.

2. Maven Wrapper:

   • Added the Maven Wrapper to standardize builds across different environments and simplify setup for contributors who may not have Maven installed locally.
   • Updated project structure to include mvnw files (mvnw, mvnw.cmd) and necessary configuration in .mvn/wrapper/.

3. Updated README files:

   • Updated build instructions in the README files from mvn clean package to ./mvnw clean package to ensure builds are run consistently with the wrapper.

Benefits:

• Improved Developer Experience: Contributors can now build and test the project without needing Maven pre-installed.
• Faster, Consistent Builds: CI ensures all changes are verified automatically, and caching significantly reduces build times.

[FDelporte]

Merging to validate the GH Action...

[FDelporte]

@dariuszzbyrad can you please check the build failure on https://github.com/Pi4J/pi4j-example-devices/actions/runs/11853017160/job/33032294662?