feat: Support files and batches APIs provided by Azure OpenAI

[CH3CHO]

Ⅰ. Describe what this PR did

Support files and batches APIs provided by Azure OpenAI in OpenAI protocol:

• /v1/files
• /v1/files/{file_id}
• /v1/files/{file_id}/content
• /v1/batches
• /v1/batches/{batch_id}
• /v1/batches/{batch_id}/cancel

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

Depends on #1886

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.41%. Comparing base (ef31e09) to head (1d544fb).
Report is 350 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1904      +/-   ##
==========================================
+ Coverage   35.91%   43.41%   +7.50%     
==========================================
  Files          69       76       +7     
  Lines       11576    12301     +725     
==========================================
+ Hits         4157     5340    +1183     
+ Misses       7104     6628     -476     
- Partials      315      333      +18     

see 71 files with indirect coverage changes

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[johnlanni]

LGTM