Fixes https://github.com/webrecorder/browsertrix/issues/1905
- adds a new top-level `/api/subscriptions` endpoint and SubOps handler on
the backend.
- enable subscriptions API endpoints available only if `billing_enabled` is
set in helm chart
- new POST /subscriptions/create, /subscriptions/update,
/subscriptions/cancel API endpoints
- Subscriptions mongo collection storing timestamped /subscription
API events
- GET /subscriptions/events API to get subscription events, support for filtering and sorting
- Subscription data model
- Support for setting and handling readOnlyOnCancel on org
- /orgs/<id>/billing-portal to lookup portalUrl using external API
- subscription in org getter and list views
- mark org as readOnly for subscription status `paused_payment_failed`, clears it on status `active`
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Co-authored-by: Tessa Walsh <tessa@bitarchivist.net>
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