Refactor the internal codebase from fx2trt_oss to torch_tensorrt

[frank-wei]

364639a8ab2ee7531ce5259b8985a3c90bda4fdf Wei Wei wwei6@fb.com [fx2trt] target files added
07d8e842b54b9c727f4215239f6c007cc7a62c9f Wei Wei wwei6@fb.com Swap fx2trt_oss to torch_tensorrt

Description

This PR is for changing import path by removing any fx2trt_oss and replace with torch_tensorrt.
Also internal linter/formatter is applied.

Fixes # (issue)

Type of change

Please delete options that are not relevant and/or add your own.

• 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)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[github-actions]

Code conforms to C++ style guidelines

[github-actions]

Code conforms to C++ style guidelines

[github-actions]

Code conforms to C++ style guidelines

[yinghai]

LGTM. Maybe we should begin check linting.