Java repositories refactoring

[Simply007]

Motivation

https://kentico.atlassian.net/wiki/spaces/CS/pages/1670480013/Java+repositories+refactoring

Review:

• [x] check that build configuration works
• [x] check the readmes and their information flow/architecture

TODO:

• [x] release v4 beta version from this branch for delivery SDK and model generators

• [x] change the name of the repository from kontent-delivery-sdk-java to kontent-java-packages

• [ ] once merged - setup automatic publishing for delivery SDK and model generators when a new version is created

• [ ] add codeowners

  Checklist

• [ ] Code follows coding conventions held in this repo

• [ ] Automated tests have been added

• [ ] Tests are passing

• [ ] Docs have been updated (if applicable)

• [ ] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

[Simply007]

Waiting once https://jcenter.bintray.com/com/github/kentico/kontent-delivery-generators is available.

https://stackoverflow.com/questions/35811888/how-long-does-it-usually-take-bintray-to-sync-to-jcenter