Redis [NEW] Denote elapsed time, response size on MONITOR

The problem/use-case that the feature addresses

The additional information of how long each query takes and how big the results, tremendously accelerates the troubleshooting process when analyzing for slow queries that impact system performance.

Description of the feature

Add a column early in MONITOR output for the duration time (eg, in milliseconds) of the query.

Add a column early in MONITOR output for the response size (eg, in bytes) of the query.

Alternatives you've considered

Handrolling a TCP proxy line editor with metrics support.

Using PostgreSQL instead of Redis