Summary of Changes

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This pull request resolves an issue where fetching Realtime Database rules (rtdb.getRules()) would fail when connected to the Firebase emulator due to missing authentication. It introduces a specialized HTTP client that automatically provides a fake 'owner' token when an emulator host is detected, enabling seamless rule retrieval in local development environments.

Highlights

• Emulator Compatibility: The DatabaseRulesClient now correctly interacts with the Realtime Database emulator by applying a fake 'owner' credential when the FIREBASE_DATABASE_EMULATOR_HOST environment variable is detected.
• New HTTP Client for Rules: A new DatabaseRulesHttpClient class has been introduced, extending AuthorizedHttpClient, to specifically handle the authentication logic for fetching database rules, especially in emulator environments.
• Conditional Token Provisioning: The getToken() method in DatabaseRulesHttpClient is overridden to conditionally return a hardcoded 'owner' token when running against an emulator, bypassing the need for actual credentials in development.

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