[feature] Add "airbyte_workspace_ids" data source

Airbyte recently changed their "[list workspaces](https://reference.airbyte.com/reference/listworkspaces)" API.  The Terraform provider should implement the updated `GET /workspaces` endpoint to provide a data source for all workspace IDs in the system (the zeroth being the auto-created workspace at start up).

see: https://github.com/airbytehq/terraform-provider-airbyte/pull/202