Add support for Catalog Metadata Ingestion

[joaoclemencio-dbtlabs]

Is your feature request related to a problem? Please describe.

External Metadata Ingestion isn't supported yet by the dbtcloud_account_features resource.

Describe the solution you'd like

Not sure if this should all be in a single issue, but as I can find there are at least 3 configurations required:

• Add the flag to the list of supported features. In the UI, this is triggered by the same API call as the others (POST to https://{dbtcloud_host}/api/private/accounts/{account_id}/features/) with the payload {feature: "catalog-ingestion", value: true}
• Add a database credentials resource to query the database metadata. In the UI, this is set in the Connection, specifically via a PATCH to https://{dbtcloud_host}/api/v3/accounts/{account_id}/platform-metadata-credentials/
• Add a catalog-configs resource that applies filters to the connection the credentials have been applied to. This is also a PATCH, but to https://{dbtcloud_host}/api/v3/accounts/{account_id}/connections/{connection with metadata credentials}/catalog-configs/ with an allow/deny list payload:

{
  "database_allow": [],
  "database_deny": [],
  "schema_allow": [],
  "schema_deny": [],
  "table_allow": [],
  "table_deny": [],
  "view_allow": [],
  "view_deny": []
}

Describe alternatives you've considered

Manually setting it in the UI; potentially querying the API separately but would prefer terraform