Remove empty resources created for service groupings

[jar-stripe]

Why?

The code generator had previously generated resources for V2 services that only contain other services, like V2.Billing, V2.Core, etc. This is undesirable because it produces strangely named files and confusing empty types. This PR updates contains generated code after modifying the code generator to treat these services like namespaces instead of resource-ful services.

This could be a breaking change as the CoreResource.d.ts and BillingResource.d.ts type definitions are being removed. The following therefore would be a type error after this change:

  const billing: Stripe.V2.BillingResource = client.v2.billing;
  const meters = await billing.meterEvents.create({

It does not change the access path through StripeClient or the interface of the services, though.

What?

• removes src/resources/V2.ts, src/resources/Billing.ts, and src/resources/V2/Core.ts
• removes types/V2/BillingResource.d.ts, types/V2/CoreResource.d.ts, and types/V2Resource.d.ts
• adds services that used to be in these files to objects within src/resources.ts

See also

http://go/j/DEVSDK-2196

[helenye-stripe]

Can we rebase this off of master to remove the non-related changes? Other than that 👍

[jar-stripe]

Can we rebase this off of master to remove the non-related changes? Other than that 👍

Done! But this includes a file that shouldn't be there (Margins.d.ts) and will continue to generate until we update the openapi version, so I think this probably needs to wait until that is resolved before we merge.