[Firebase AI] Add references to zip frameworks in xcodeproj

[andrewheard]

• Added references to the zip frameworks in the FirebaseAIExample Xcode project in a Firebase directory (this aligns with where they are extracted in the zip quickstart tests in firebase-ios-sdk.
• Updated imports to use import FirebaseAILogic when available. The #if canImport(FirebaseAILogic) can be removed after the rename is released.

[gemini-code-assist]

Summary of Changes

Hello @andrewheard, 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 updates the FirebaseAIExample Xcode project to correctly integrate with a new framework structure, specifically addressing the renaming of the FirebaseAI module to FirebaseAILogic. It ensures that the example project properly references and embeds the necessary Firebase .xcframework files, preparing it for building and running with the updated dependencies.

Highlights

• Xcode Project Updates: The FirebaseAIExample Xcode project has been updated to include references to several Firebase .xcframework files, ensuring proper linking and embedding of these dependencies for zip-based distribution.
• Conditional Module Imports: Swift source files across the example project have been modified to conditionally import FirebaseAILogic if available, falling back to FirebaseAI. This change anticipates a module rename and ensures compatibility during the transition period.
• Framework Organization: A new 'Firebase' group has been added to the Xcode project to logically organize the newly referenced Firebase .xcframework dependencies, aligning with the structure used in quickstart tests.

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[gemini-code-assist]

Code Review

This pull request adds references to zipped frameworks in the Xcode project and updates Swift files to conditionally import FirebaseAILogic or FirebaseAI. The changes look good overall. I've added a few suggestions to improve the maintainability of the Xcode project file by sorting framework lists. I also suggested a way to centralize the conditional import logic to reduce code duplication across the Swift files, which would make the eventual cleanup easier.