Start storing more detail about marketplaces for billing

[travjenkins]

Background

The UI needs to be able to know some more details when the tenant is using external payment. Right now that covers both people handling manual billing/contracts and when using a 3rd party marketplace like Google or AWS. We can figure out if Google is used with the gcm_account_id column.. However, for anything else we do not really know.

Split off from: estuary/ui#1443

Request

I think we could have two simple choices

First Idea

We should expand the public.payment_provider_type type to allow for some more detail beyond external. Potentially we add all the payment providers we support there?

The enum would become something like... 'stripe', 'external', 'gcp', 'aws'

I think this might mean extra work for billing/invoicing/etc. because then we might need more handled than just is 'external'

Second Idea

We add a new column to the tenant table that stores something we need for aws in a new column. This would probably be something similar to how we do it for Google where we store their account id.