feat: add cached token parsing for Gemini , Antigravity API responses

[NguyenSiTrung]

Add support for parsing cachedContentTokenCount field in Gemini , Antigravity API responses.

This adds cached token tracking to:

• parseGeminiCLIUsage
• parseGeminiUsage
• parseGeminiStreamUsage
• parseGeminiCLIStreamUsage
• parseAntigravityUsage
• parseAntigravityStreamUsage

[gemini-code-assist]

Summary of Changes

Hello @NguyenSiTrung, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new capability to accurately track cached content tokens within Gemini API responses. By incorporating the cachedContentTokenCount field into various usage parsing functions, the system can now provide a more comprehensive and precise accounting of token consumption, which is crucial for billing, resource management, and performance analysis.

Highlights

• Gemini API Response Parsing: Added support for parsing the cachedContentTokenCount field from Gemini API responses, enhancing the detail of token usage tracking.
• Expanded Token Tracking: Integrated the new cached token tracking into six existing usage parsing functions: parseGeminiCLIUsage, parseGeminiUsage, parseGeminiStreamUsage, parseGeminiCLIStreamUsage, parseAntigravityUsage, and parseAntigravityStreamUsage.

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[gemini-code-assist]

Code Review

This pull request adds support for parsing cachedContentTokenCount from Gemini API responses across various usage parsing functions. The changes are correct and consistently applied. My main feedback is regarding code duplication. The logic for parsing usage details is now repeated in six different functions. I've left a comment suggesting a refactoring into a helper function to improve maintainability. This can be addressed in a follow-up PR.

[NguyenSiTrung]

@hkfires , @luispater please help me review this . Thanks