Logging fetcher should provide more detail with status codes

[Qinusty]

#27 (comment) highlights a problem with the clarity of the logging fetcher providing information in the case of an error, we should also look to include the GRPC error name alongside the code or perhaps even the message that the error is wrapped with.

See

bb-remote-asset/pkg/fetch/logging_fetcher.go

Line 27 in fa2fbc2

log.Printf("FetchBlob completed for %s with status code %d", req.Uris, resp.Status.GetCode())