[fix #12] Implement Google authentication using Firebase OAuth

[ahammadabdullah]

Overview: This pull request implements Google authentication using Firebase OAuth, enhancing the user experience by allowing users to sign in with their Google accounts. This addition streamlines the login process and reduces the need for users to create and remember separate credentials.

Changes Made:

• Integrated Firebase authentication into the existing authentication flow.
• Added a Google sign-in button that triggers the Firebase authentication process.
• Updated the user interface to accommodate the new authentication option.
• Modified the backend to handle user data from Google sign-ins, including email and display name.

Benefits:

• Improved user experience by offering a faster and more convenient login option.
• Increased user engagement and potential user retention.
• Reduced barriers to entry for new users.

Testing:

• Verified that Google sign-in works as expected.
• Ensured that user data is correctly stored and retrieved in the database.
• Confirmed that existing email/password authentication remains functional.

Next Steps:

• Monitor user feedback and make adjustments as necessary.
• Consider implementing additional OAuth providers in the future.

Thank you for reviewing this PR! I look forward to your feedback.

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