SHOW STAT should show average request size

Registered by Kostja Osipov

Currently there is no way to see how big is response to an average request.
To help performance analysis, we should also show the following:
- the number of key lookups per second
- the number of matched tuples per second
- the number of tuples written to network per second
- the number of bytes read per second
- the number of bytes written per second

Perhaps we need a separate statement for this, SHOW IO/ SHOW IOSTAT?

Blueprint information

Status:
Not started
Approver:
Kostja Osipov
Priority:
Undefined
Drafter:
Kostja Osipov
Direction:
Needs approval
Assignee:
Pavel Cherenkov
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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