Added google drive as a provider to sync notes.

This pull request introduces Google Drive as a new provider for syncing notes. It includes updates to both the frontend and backend to support Google Drive integration.

Frontend Changes

Component Added: CloudSyncComponent
- Allows users to select Google Drive, along with other cloud providers (Joplin Cloud, Dropbox, OneDrive), for note synchronization.
- Clicking a provider button redirects users to the authentication endpoint for that provider.

Backend Changes

Google OAuth 2.0 Integration:
- Added Passport.js configuration for Google OAuth 2.0 using passport-google-oauth20.
- Configured Google Client ID, Client Secret, and callback URL.
- Implemented serialization and deserialization of user sessions.

Changes Summary

Updated CloudSyncComponent to include Google Drive as a synchronization option.
Configured Google OAuth 2.0 authentication in Passport.js.
Added required environment variables for Google authentication.

Setup Instructions

Environment Variables:
- Ensure the following environment variables are set in your .env file:
  - GOOGLE_CLIENT_ID
  - GOOGLE_CLIENT_SECRET
Backend Configuration:
- Update your backend to handle the /auth/google/callback route for Google authentication.

Testing

Verify that the Google Drive button in the frontend redirects to Google's OAuth authentication page.
Confirm that the backend correctly processes the OAuth callback and authenticates users with Google.

Additional Notes

This update provides users with an additional option for syncing their notes across various cloud platforms, improving flexibility and integration options.

priyasirohi09 / joplin