feat: #13: Razorpay integration

[ItsFlash10]

@hkirat, moved rzp code from my codebase to here as you mentioned.

NOTE: This has multiple commits since I was working on a separate codebase for this as well, it can be squashed and merged prolly.

• Razorpay Integration.
• Added prettier-tailwind-plugin to sort the classes better.

PR Fixes: #13 #16

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] I assure there is no similar/duplicate pull request regarding same issue

https://github.com/user-attachments/assets/117c7009-4647-4e80-94db-c344a6afc3f5

Testing Creds:

[ItsFlash10]

@hkirat can you please review this

[hkirat]

@devsargam

[ItsFlash10]

@devsargam Added webhook validation and made a custom hook for payment logic cc: @hkirat

[hkirat]

/bounty $50