refactor: ollama provider

[venjiang]

Description

ollama llm provider is supports.

Known Issues:

• ollama does not support function calling on stream mode, so non-stream mode calls are used when a function call occurs, it is a temporary solution.
• ollama #6452 merge or ollama fully supports function calling on stream mode, this will be overwritten.

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
yomo	⬜️ Ignored (Inspect)	Visit Preview		Sep 6, 2024 10:43am

[codecov]

Codecov Report

Attention: Patch coverage is 30.90909% with 38 lines in your changes missing coverage. Please review.

Project coverage is 79.08%. Comparing base (c91a388) to head (8000a4f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/bridge/ai/service.go	30.90%	36 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #866      +/-   ##
==========================================
- Coverage   79.86%   79.08%   -0.79%     
==========================================
  Files          50       50              
  Lines        2880     2935      +55     
==========================================
+ Hits         2300     2321      +21     
- Misses        412      442      +30     
- Partials      168      172       +4     

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