feat(ai): add generated GenerateContent API types

[andrewheard]

Added GenerateContent API types auto-generated from the OpenAPI spec. The generated files have the extension .gen.swift to work around file name overlaps with existing public types. They were directly added to the FirebaseAILogic target, rather than a separate one, in order to satisfy both CocoaPods and SPM, which emitted different warnings/errors about unused package import Foundation or missing Foundation import. The generated types are unused in this PR and wiring them up was split into #16446.

#no-changelog

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Summary of Changes

This pull request introduces a set of auto-generated API types for the GenerateContent functionality within the FirebaseAI component. These types were generated from the OpenAPI specification to ensure consistency and are intended to be wired up in a subsequent pull request. The changes are localized to the FirebaseAILogic target to ensure compatibility across different package managers.

Highlights

• API Type Generation: Added auto-generated GenerateContent API types from the OpenAPI specification to the FirebaseAILogic target.
• File Naming Strategy: Utilized the .gen.swift file extension for generated types to prevent conflicts with existing public types.
• Configuration: Updated .gitignore to include new test resources and configuration files for FirebaseAI.

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Activity

• Pull request created by andrewheard.
• Gemini Code Assist bot provided guidance on usage.
• Author requested a summary via /gemini summary.

[paulb777]

LGTM.

One of Gemini's comments 😄

By restricting the iOS SDK's new models to the stateless generateContent paradigm, the Firebase AI Logic SDK misses out on the core features designed for agentic, multi-turn, and long-running AI workflows