v3.2.0 Feature: Add Stripe subscription model to Taboo AI

[xmliszt]

ToDos

• [x] Set up Stripe account
• [x] Firebase db model setup with token count for user
• [x] PRO plan subscribe flow
• [x] Downgrade to FREE plan flow ( == Cancel subscription)
• [x] Cancel free trial?
• [x] User delete account will cancel subscriptions as well, but keep customerId (prevent exploit on free trial), reset customerPlanType to 'free'
• [x] Robust Testing
• [x] Better access to Pricing Page
• [x] User can manage the subscription
• [x] Update subscription plan features: FREE: only the latest 1 game result in profile for viewing (Different UI design). PRO: the latest 10 game results in profile for viewing.

Resources:

• https://vercel.com/guides/getting-started-with-nextjs-typescript-stripe
• https://medium.com/@drtechpunk/how-to-set-up-stripe-subscriptions-for-nextjs-13-with-the-app-directory-e36f1df204db

House keeping

• [x] Add firebase cloud functions deployment to the pipeline
• [x] Update Stripe product description for actual

Next Steps - Handle PRO feature flag

• [x] Profile > Latest 1 | 10 game results to display
• [x] AI Mode