collab: Add billing_subscriptions table (#15448)

This PR adds a new `billing_subscriptions` table to the database, as
well as some accompanying models/queries.

In this table we store a minimal amount of data from Stripe:

- The Stripe customer ID
- The Stripe subscription ID
- The status of the Stripe subscription

This should be enough for interactions with the Stripe API (e.g., to
[create a customer portal
session](https://docs.stripe.com/api/customer_portal/sessions/create)),
as well as determine whether a subscription is active (based on the
`status`).

Release Notes:

- N/A

crates/collab/src/db/tests.rs

@@ -1,3 +1,4 @@
+mod billing_subscription_tests;
 mod buffer_tests;
 mod channel_tests;
 mod contributor_tests;