Improve publishing configuration

[MGaetan89]

Pull request

Description

This PR creates a custom Gradle plugin to handle the publishing logic of our library modules: pillarbox-analytics, pillarbox-core-business, pillarbox-player, and pillarbox-ui.
By doing this, we can have the publishing logic in one place, so it is easier to maintain in the future, if the Gradle API changes, the Maven URL changes, ...

Note

To test this, I've published each module to Maven local, by running ./gradlew :<module>:publishToMavenLocal, but I didn't try an actual publication. Since we're doing a new release soon, it will be a good opportunity to test this.

Changes made

• Self-explanatory

Checklist

• Your branch has been rebased onto the main branch.
• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).
• All pull request status checks pass.

[MGaetan89]

Putting this to draft, as I discovered a couple more things that could be handled by the plugin.

[github-actions]

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