Use Github Actions and Github Packages to publish the Java package

[josuablejeru]

This PR primarily focuses on the implementation of the Java GS1 helper. Once approved, similar implementations in other languages will follow.

Changes made:

• Refactored Github actions to utilize working directories instead of navigating into each subdirectory.
• Implemented deployment of the final build to Github Packages using Maven, enabling users to download it with both Gradle and Maven.
• Specified the Github Package Registry within distributionManagement to inform Maven about the deployment destination.

Noteworthy:

Currently, Github actions are disabled for this repository, preventing me from testing these changes as I typically do. Furthermore, due to the disabled GH Issue feature, I couldn't discuss the use of Actions for deploying to common registries earlier. I believe this could greatly benefit the project in the future, making it more inviting for contributors and facilitating discussions.

[terryburton]

Please refer to issue #2 for an update. There is no need to rebase this to address the conflicts and we'll pick up the final change in due course if the decision is to provide package hosting.