* Refactor: Rename some methods and models for consistency
This commit contains no logic changes at all. It's entirely comprised of renames of existing models and methods to bring our codebase more in line with our app's functionality and terminology.
* Add feature flag: AC-2476-deprecate-stripe-sources-api
* Standardize error responses from applicable billing controllers
During my work on CB, I found that just using the built-in TypedResults errors results in the client choking on the response because it's looking for the ErrroResponseModel. The new BaseBillingController provides Error utilities to return TypedResults wrapping that model so the client can process it.
* Add feature flagged payment method endoints to OrganizationBillingController
* Run dotnet format
* Moved AccountsBilling controller to be owned by Billing
* Added org billing history endpoint
* Updated GetBillingInvoicesAsync to only retrieve paid, open, and uncollectible invoices, and added option to limit results
* Removed invoices and transactions from GetBillingAsync
* Limiting the number of invoices and transactions returned
* Moved Billing models to Billing namespace
* Split billing info and billing history objects
* Removed billing method GetBillingBalanceAndSourceAsync
* Removed unused using
* Cleaned up BillingInfo a bit
* Update migration scripts to use `CREATE OR ALTER` instead of checking for the `OBJECT_ID`
* Applying limit to aggregated invoices after they return from Stripe
