[Refactor] Refactor torchair

[wangxiyuan]

Move tochair related code to a new module for better code maintainance

TODO:

1. mla is still there, since it's only used for deepseek. We can refactor it later.
2. some ops are still there, we'll find a better way to register the ops with different case.

• vLLM version: v0.9.1
• vLLM main: vllm-project/vllm@5358cce

[codecov]

Codecov Report

❌ Patch coverage is 93.93939% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.46%. Comparing base (c30ddb8) to head (c589d9b).
⚠️ Report is 644 commits behind head on main.

Files with missing lines	Patch %	Lines
vllm_ascend/torchair/utils.py	92.18%	5 Missing ⚠️
vllm_ascend/platform.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1661       +/-   ##
===========================================
+ Coverage   27.39%   54.46%   +27.06%     
===========================================
  Files          56       81       +25     
  Lines        6191     9921     +3730     
===========================================
+ Hits         1696     5403     +3707     
- Misses       4495     4518       +23     

Flag	Coverage Δ
unittests	54.46% <93.93%> (+27.06%)	⬆️

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[github-actions]

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[github-actions]

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[wangxiyuan]

Will createa new one instead.