[Firebase AI] Add FirebaseAIExampleZip scheme for zip testing

[andrewheard]

Added a target and scheme that does not have the SPM dependency included for FirebaseAI. This allows us to test the zip build from the firebase-ios-sdk repo.

[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 enhances the Firebase AI example project by introducing a new build configuration. It adds a dedicated Xcode target and scheme, FirebaseAIExampleZip, which is specifically tailored to facilitate testing of the Firebase AI SDK when integrated as a zip build, rather than through Swift Package Manager. This ensures comprehensive testing coverage for different distribution methods of the SDK, allowing for validation of the example app's functionality under a zip-based integration scenario.

Highlights

• New Xcode Target Added: A new Xcode target named FirebaseAIExampleZip has been introduced to the project configuration.
• New Xcode Scheme Created: A corresponding Xcode scheme, FirebaseAIExampleZip.xcscheme, has been added to define how this new target is built, run, and tested.
• Purpose for Zip Testing: This new target and scheme are specifically designed to enable testing of the Firebase AI example application when the Firebase AI SDK is integrated via a zip distribution, explicitly bypassing its Swift Package Manager dependency.
• Dependency Configuration: The FirebaseAIExampleZip target is configured with its own set of build phases, including all necessary source files, resources, and framework dependencies such as MarkdownUI and GenerativeAIUIComponents.

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[gemini-code-assist]

Code Review

This pull request introduces a new FirebaseAIExampleZip target and scheme to test the zip distribution build. The changes are primarily within the Xcode project configuration. I've identified a critical issue where the new target shares the same bundle identifier as the existing one, which will lead to installation conflicts. Additionally, there's a minor inconsistency in the product name for the new target that should be addressed for better maintainability. Addressing these points will ensure the project configuration is correct and robust.

[paulb777]

Probably not a big deal, but may be slightly confusing to quickstart users to see a selectable scheme that won't work without copying the zip in.

How about making sure https://github.com/firebase/quickstart-ios/blob/main/firebaseai/README.md makes it clear which scheme to select?

[ncooke3]

Clever to add a scheme!

[ncooke3]

@paulb777's when my WIP PRs are done. This extra scheme can be deleted in favor of a script that can remove the SPM dependency and swap in XCFrameworks.

[paulb777]

OK, then I'm fine with this for the short term

[andrewheard]

Probably not a big deal, but may be slightly confusing to quickstart users to see a selectable scheme that won't work without copying the zip in.

How about making sure main/firebaseai/README.md makes it clear which scheme to select?

Good idea, @paulb777. Added a note in the README to select the FirebaseAIExample (iOS) scheme since I can't include the zip artifacts (unsigned) and can't provide instructions to use the zip (not yet released). (And as @ncooke3 said, we should remove this once the WIP PRs are done.)