console: set up a basic Stripe payments UI

[epost]

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