[misc] refactor: refactor the folders structure

[zhtmike]

What does this PR do?

1. refactor the folders strcutures, add verl dependency

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[gemini-code-assist]

Code Review

This pull request refactors the repository to rename the core package from verl to verl_omni, focusing on RL training for diffusion and omni-modality models. The changes include comprehensive updates to imports, configuration paths, and project metadata, as well as the removal of legacy PPO configurations. Feedback indicates that version requirements for tensordict, vllm, and verl appear incorrect or refer to non-existent public versions, which could lead to installation failures. Additionally, a suggestion was made to update the import path for TrainingWorkerConfig in the test suite to maintain consistency with the new package structure.

[SamitHuang]

Maybe we can add log info here, to remind dropping these patches in future version

[zhtmike]

Done

[SamitHuang]

specify the version?

[zhtmike]

Done

[SamitHuang]

did you try to install in this way?

[zhtmike]

No, we hold a temporally version here. I think it should be formally supported with 0.8.0?