Implement OAuth authentication (Google, LinkedIn, GitHub)

[Prajwal-kp-18]

Description: We need to implement OAuth authentication with Google, LinkedIn, and GitHub to allow users to sign in using their respective accounts. This will streamline the authentication process and improve user experience by leveraging existing credentials. The integration should handle authentication flow, user authorization securely and efficiently.

Tasks:

• Configure OAuth integration with Google, LinkedIn, and GitHub APIs.
• Implement frontend components for OAuth login buttons.
• Develop backend endpoints to handle OAuth authentication callbacks.
• Store and manage OAuth tokens securely.

Expected Outcome: Users should be able to log in using their Google, LinkedIn, or GitHub accounts, with their OAuth tokens securely managed and authenticated across our platform.