Added route handler to verify and save user info in db ( google sign in )

[mehul-m-prajapati]

🛠️ Fixes Issue

Fixes: #550

👨‍💻 Description

• Added route handler to verify and save user info in db
• Added token verification
• Used oauth lib to get payload

📄 Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update (adds or updates related documentation)

📷 Screenshots/GIFs (if any)

✅ Checklist

• [x] I am a participant of GSSoC-ext.
• [x] I have followed the contribution guidelines of this project.
• [x] I have viewed deployment of my code.
• [x] My changes generate no new warnings.
• [x] I have made this change from my own.
• [x] I have taken help from some online resources.
• [x] My code follows the style guidelines of this project.
• [x] I have performed a self-review of my own code.
• [x] I have added documentation to explain my changes.

🤝 GSSoC Participation

• [x] This PR is submitted under the GSSoC program.
• [x] I have taken prior approval for this feature/fix.

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[github-actions[bot]]

Thank you for submitting your pull request! 🙌 We'll review it as soon as possible. In the meantime, If there are any specific instructions or feedback regarding your PR, we'll provide them here. Thanks again for your contribution! 😊

[aslams2020]

This PR has been merged by the GSSoC team here - https://github.com/sanjay-kv/Open-source-Practice/pull/1463

Don't add labels to it now.

You'll get the points in the leaderboard update.