console: set up a basic Stripe payments UI

[epost]

• [x] read some docs
  • [x] Stripe Elements (this looks like it may be what we want)
  • [ ] Stripe Checkout
  • [x] Stripe PaymentIntents
  • [x] Stripe Billing
• [x] get Stripe account
  • [ ] activate account
  • [ ] read some more docs
• [x] create Statebox Console Firebase app under statebox-kdmoncat project
  • [x] find the bloody 'add app' button- [x] Set up some example code
  • [x] Research Stripe cookie warnings/errors discussed in https://github.com/stripe/react-stripe-elements/issues/445.
  • [ ] Firebase authentication
  • [x] Wrap around Halogen app
  • [ ] Invoices
  • [x] Define types & codecs
  • [x] Create Stripe API call in backend
  • [x] Create backend API call in frontend
  • [x] Render in UI
  • [ ] Customer
  • [x] Define types & codecs
  • [x] Create Stripe API call in backend
  • [x] Create backend API call in frontend
  • [x] Render in UI
  • [ ] PaymentMethods
  • [x] Define types & codecs
  • [x] Create Stripe API call in backend
  • [x] Create backend API call in frontend
  • [x] Render in UI