update ai-cache extension

[mirror58229]

Ⅰ. Describe what this PR did

1. Change ctx.DontReadRequestBody to ctx.DontReadResponseBody in onHttpRequestBody
2. Move the logic for checking ERROR_PARTIAL_MESSAGE_KEY to onHttpResponseBody. The previous logic would not work correctly because a response may have only one header but multiple bodies.
3. Update the documentation to reflect that the cache database will be used first when both configured.

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.61%. Comparing base (ef31e09) to head (05e3833).
Report is 287 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1746      +/-   ##
==========================================
+ Coverage   35.91%   43.61%   +7.70%     
==========================================
  Files          69       76       +7     
  Lines       11576    12358     +782     
==========================================
+ Hits         4157     5390    +1233     
+ Misses       7104     6630     -474     
- Partials      315      338      +23     

see 70 files with indirect coverage changes

[johnlanni]

LGTM