Add the new vendor backend ENFLAME

[gongxijun]

# Description

Add the new vendor backend ENFLAME

## Type of change

- [ √ ] New feature (non-breaking change which adds functionality)

## Changes

Please list the changes introduced in this PR:

-  Add enflame ops register
-  Add enflame backend implementation
-  Register enflame ops in builtin_ops.py

## Requirements

- The module migraiton is needed, to use this module, need to install package migration whl

# Checklist:

- [x] I have read and followed the [contributing guidelines](https://github.com/NVIDIA/TransformerEngine/blob/main/CONTRIBUTING.rst)
- [x] The functionality is complete
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] 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

[CLAassistant]

All committers have signed the CLA.