The Otel semantic conventions say the span around a RPC should be the name of the RPC command, which in our world is the command name. We can get this from the message being sent, but right now we need to start a span with a SpanName, so we need to map the command name to a SpanName.

Also, in dbclient_base, we currently can't distinguish the RPC case from the in-process case. This can probably be fixed by changing the type for "DBDirectClient" to local (from standalone), as the type isn't currently used in a way that would make this problematic.