Add configuration option for events.subgraph.request|response|error to target only specified subgraphs

[bnjjj]

With this configuration:

telemetry:
  apollo:
    client_name_header: name_header
    client_version_header: version_header
  instrumentation:
    events:
      subgraph:
        # Standard events
        request: info
        response: warn
        error: error

It would be great to be able to specify subgraphs we want to log. No need for this for custom events because we can still use the subgraph.name selector as a condition