core: add 'custom model' field for OpenAI API like.

[hu-qi]

close #94

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 11.69%. Comparing base (c139860) to head (e001c12).

Files	Patch %	Lines
.../cc/unitmesh/devti/settings/LLMSettingComponent.kt	0.00%	8 Missing ⚠️
...in/cc/unitmesh/devti/llms/openai/OpenAIProvider.kt	0.00%	4 Missing ⚠️
...ain/kotlin/cc/unitmesh/devti/settings/Constants.kt	0.00%	2 Missing ⚠️
...cc/unitmesh/devti/settings/AutoDevSettingsState.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
- Coverage   11.70%   11.69%   -0.02%     
==========================================
  Files         354      354              
  Lines        8763     8773      +10     
  Branches     1675     1677       +2     
==========================================
  Hits         1026     1026              
- Misses       7510     7520      +10     
  Partials      227      227              

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[phodal]

Thanks