aiproxy 360代理支持embedding模型

[hackerYHT]

Ⅰ. Describe what this PR did

aiproxy 360代理支持embedding模型

Ⅱ. Does this pull request fix one issue?

fixes #951

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

Ⅳ. Describe how to verify it

openai协议，请求embedding模型

curl --location 'http://127.0.0.1:10000/v1/embeddings' \
--header 'Content-Type:  application/json' \
--data '{
  "input":["你好"],
  "model":"text-embedding-3-small"
}'

回复

{
  "data": [
    {
      "embedding": [
        -0.011237,
        -0.015433,
        ...,
        -0.042201
      ],
      "index": 0,
      "object": ""
    }
  ],
  "model": "embedding_s1_v1.2",
  "object": "",
  "usage": {
    "prompt_tokens": 2,
    "total_tokens": 2
  }
}

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.30%. Comparing base (ef31e09) to head (ccacc27).
Report is 61 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1247      +/-   ##
==========================================
+ Coverage   35.91%   44.30%   +8.39%     
==========================================
  Files          69       75       +6     
  Lines       11576     9821    -1755     
==========================================
+ Hits         4157     4351     +194     
+ Misses       7104     5143    -1961     
- Partials      315      327      +12     

see 80 files with indirect coverage changes

[CH3CHO]

LGTM