Add Angular starter example

[zinderud]

This PR adds a new Angular starter example for Smart Wallets integration and updates t

Changes:

• Added examples/angular-starter/ with a complete Angular application demonstrating Smart Wallets usage

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PR-Codex overview

This PR introduces an Angular starter project for building applications with Smart Wallets, integrating email OTP authentication and external wallet connections. It enhances the application structure, adds services for wallet management, and includes components for user interface.

Detailed summary

• Added environment.ts and environment.development.ts for API key configuration.
• Created routing in app.routes.ts for navigation.
• Implemented AccountKitService for smart wallet functionality.
• Developed WalletService for external wallet connections.
• Added Home and WalletConnectComponent for user interaction.
• Included HTML templates and SCSS styles for components.
• Established unit tests for WalletService, Home, and WalletConnectComponent.
• Updated README.md with setup instructions and usage guidelines.

The following files were skipped due to too many changes: examples/angular-starter/yarn.lock, examples/angular-starter/package-lock.json

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