Rename FirebaseAISample to FirebaseAIExample and update README

[YoungHypo]

Renamed all occurrences from FirebaseAISample to FirebaseAIExample to fix a naming inconsistency, including file names, READE.md, and corresponding references in the code. The project files now are structured as follows.

~/quickstart-ios/firebaseai (fix-firebaseai-doc) » tree -L 1                                                                                             
.
├── ChatExample
├── FirebaseAIExample
├── FirebaseAIExample.xcodeproj
├── FunctionCallingExample
├── GenerativeAIMultimodalExample
├── GenerativeAITextExample
├── GenerativeAIUIComponents
├── GoogleService-Info.plist
├── ImagenScreen
└── README.md

[gemini-code-assist]

Summary of Changes

Hello @YoungHypo, 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 focuses on enhancing consistency and clarity within the Firebase AI quickstart project by performing a comprehensive rename from 'Sample' to 'Example'. This change affects file paths, Xcode project configurations, in-code references, and user-facing documentation, ensuring a unified and accurate terminology throughout the repository.

Highlights

• Project-wide Renaming: The core change involves renaming all occurrences of FirebaseAISample to FirebaseAIExample across the project. This includes updating directory names, Xcode project file references (project.pbxproj), and build scheme configurations (.xcscheme).
• Codebase Consistency: Internal code references, such as navigationTitle values in various SwiftUI views (e.g., ConversationScreen, ErrorView, MessageView, PhotoReasoningScreen, GenerateContentScreen, ImagenScreen), and the main application struct (FirebaseAISampleApp), have been updated from using 'sample' to 'example' for improved clarity and consistency.
• Documentation Updates: The README.md file has been revised to reflect the new project name, update the instructions for opening the Xcode project, and add a crucial step for enabling the necessary Gemini Developer API and Vertex AI Gemini API in the Firebase Console.

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[gemini-code-assist]

Code Review

The pull request renames FirebaseAISample to FirebaseAIExample for consistency across the project. The changes include updates to file names, project configurations, and documentation. The README has been updated with instructions to enable the Gemini API.

[peterfriese]

LGTM, please address the suggestions Gemini made and which I thumbed-up.

Resolved