Nvfuser moving python tests and files under nvfuser (#95155)
1. Moving `test_jit_cuda_fuser.py` `test_nvfuser_dynamo.py` `test_nvfuser_frontend.py` under `third_party/nvfuser/python_tests/`.
2. Moving `nvfuser/__init__.py` to `third_party/nvfuser/python/`.
3. Leaving dummy test scripts under `./test/` for CI.
4. Patching `torch/_prims/nvfuser_prims.py` for view/reshape renaming in nvfuser
5. Installing `third_party/nvfuser/python` and `third_party/nvfuser/python_tests` to pytorch root/test directy.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/95155
Approved by: https://github.com/davidberard98
