Log functions should redact the `authorization` key value when logging the request metadata

[ixmatus]

grpc-mqtt/src/Network/GRPC/MQTT/RemoteClient.hs

Line 245 in db362db

, " Metadata: " <> show (toMetadataMap <$> reqMetadata)

... perhaps even being able to provide a log metadata map key redaction list via session args or something would make it nicer if there are secrets in the Metadatamap other than the authorization key that users don't want recorded by logging.