[JAX] Splitting cpp_extensions.py

[phu0ngng]

Description

• This PR Splits the jax/cpp_extensions.py into multiple files by category. New files are now in the jax/cpp_extensions/ dir.
• All cpp extension functions are now imported as a part of the tex module.
• Renaming mlp.py and fused_attn.py to layernorm_mlp.py and attention.py. (I may move these module files into a new modules folder to be consistent with TE/PyTorch).

There is no change in the implementation.

Type of change

• [ ] Documentation change (change only to the documentation, either a fix or a new content)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] I have read and followed the contributing guidelines
• [x] The functionality is complete
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[denera]

Is this a duplicate with #883?

[phu0ngng]

Hi @denera, This is not a duplicate of #883. I apologize for the very confusing names. I updated the name of the old PR to make it more clear. I also rebased so that the changes in the old PR are not included in the PR. Happy review ^^!

[denera]

/te-ci jax

[phu0ngng]

/te-ci jax