Consider extending logging with timing of requests

[lalvarezguillen]

Could it make sense to extend the logging of this library with measures of the time that a request took? It'd be pretty easy, since that kind of logging is isolated on the raw_request methods of JSONRPCWallet and JSONRPCDaemon

I can see the info being very useful

[dethos]

@lalvarezguillen do you see it being useful for debugging or for providing some kind of metric on a production system?

The correct logging level depends on this information.

[lalvarezguillen]

Good question. I think it could fulfill both roles.