fix: ModelPicker not snapshotted and refactor ModelPicker

[System233]

Description

Bug Fixes:

1. Fixed an issue where ModelPicker was still referencing ExtensionStateContext and was not properly snapshotted.
2. Corrected a type constraint issue where openAiCustomModelInfo was incorrectly mapped to the undeclared key: openAiModelInfo.

User Experience Improvements:

1. Simplified the implementation of CustomModel input, making inputs more convenient and user-friendly.
2. Added an auto-complete feature to the ModelId input field.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist:

• My code follows the patterns of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

Additional context

Related Issues

Reviewers

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Important

Fix and refactor ModelPicker to improve snapshotting and add auto-complete feature.

• Bug Fixes:
  • Fix ModelPicker not being properly snapshotted and remove references to ExtensionStateContext.
  • Correct type constraint for openAiCustomModelInfo in ApiOptions.tsx.
• Refactoring:
  • Consolidate multiple model picker components into a single ModelPicker component in ModelPicker.tsx.
  • Remove OpenAiModelPicker, OpenRouterModelPicker, GlamaModelPicker, RequestyModelPicker, and UnboundModelPicker.
• Features:
  • Add auto-complete feature to ModelPicker using Combobox in ModelPicker.tsx.
  • Simplify CustomModel input handling in ApiOptions.tsx.
• Testing:
  • Update ModelPicker.test.tsx to test new auto-complete functionality and refactored ModelPicker behavior.

^{This description was created by for be47c8c. It will automatically update as commits are pushed.}

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