feat: initial implementation for setting up fetchsigninwithemail behaviour

[russellwheatley]

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Summary of Changes

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This pull request introduces a robust mechanism for handling authentication errors where a user attempts to sign in with a different provider than previously used for the same email. It provides a new behavior that fetches and presents alternative sign-in methods, along with corresponding UI components for React and Angular, to guide users through the recovery process. This significantly improves the user experience by preventing dead ends during sign-in and offering clear paths to resolve credential conflicts.

Highlights

• New Legacy Sign-In Recovery Behavior: Introduced a new legacyFetchSignInWithEmail behavior in @firebase-oss/ui-core to augment OAuth auth/account-exists-with-different-credential flows. This behavior fetches and stores available sign-in methods for a user's email, enabling recovery from mismatched credentials.
• Cross-Platform UI Components for Recovery: Added dedicated UI components (LegacySignInRecoveryComponent for Angular and LegacySignInRecovery for React) to automatically render the recovery state as a modal on SignInAuthScreen and OAuthScreen. These components guide users to sign in with their previously used method.
• Granular UI Control: Provided showLegacySignInRecovery props for SignInAuthScreen and OAuthScreen in both React and Angular, allowing developers to hide the built-in recovery UI and implement custom recovery flows using new hooks/injectors (useLegacySignInRecovery for React, injectLegacySignInRecovery/injectClearLegacySignInRecovery for Angular).
• Enhanced Error Handling: Modified the core error handling logic to clear legacy sign-in recovery state and attach email information to errors, improving the context provided during authentication failures.
• Documentation and Examples: Updated the README.md with comprehensive documentation for the new legacyFetchSignInWithEmail behavior and its associated UI components and hooks. A new demo screen was added to the React example application to showcase the recovery flow.

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