Scien 10 payment gateway integration

:sparkles: Description

This pull request introduces enhancements for payment processing and Stripe integration. It includes the implementation of payment checkout, handling payment status after checkout, adding Stripe keys environment variables, configuring server-side checkout, and performing necessary dependency updates. As well as all the app features that come along with it.

:link: Related Issues

SCIEN-10

:bulb: Additional Information

The following features are to be done for pre/post payment processing:

[x] Protect the checkout route if the user is not logged in.
[x] Prefill customer data: prefill the customer’s email address in the email input field from the email stored in the user's session.
[x] Create a payments table to store user's payment and subscription details.
[x] Make payments controller and implement it in stripe checkout and webhook
[x] Set up a webhook to fulfill the subscription after a payment succeeds: update database and user subscription details.
[x] Add api endpoint to check user's subscription.
[x] Display a special badge for premium users in Navigation Bar.
[x] Prevent user from subscribing if he is already subscribed.

Note: In testing, you should run the command below to listen to stripe webhook to handle payments' sessions "stripe listen --forward-to localhost:3000/webhook"

🟢Pull Request is ready to be merged.

Md7tz / MindIndex