[Firebase AI] Add support for configuring a thinking budget

[andrewheard]

Added support for configuring the thinkingBudget in Gemini 2.5 series models.

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[google-oss-bot]

	1 Warning
⚠️	New public headers were added, did you remember to add them to the umbrella header?

Generated by 🚫 Danger

[gemini-code-assist]

Code Review

This pull request successfully adds support for configuring a thinking budget in Gemini 2.5 series models. The changes include updates to data structures for request and response, as well as comprehensive integration tests. The new ThinkingConfig is well-defined. Minor improvements suggested involve adding documentation comments for new public properties in GenerateContentResponse and GenerationConfig to enhance SDK usability.

[paulb777]

LGTM on green