go/oasis-node/cmd/control: Add runtime-stats

[Yawning]

This is a cleaned up version of the command in the tools repository.

Fixes #4425

[gw0]

If I see correctly, this PR only implements the runtime-status command to get on-demand statistics for all nodes for a runtime in a specific interval. Node operators are more concerned with the current health of its own node (not historical and not for other nodes).

It would probably be better to continuously monitor these runtime stats as counters of all runtimes running on the current node. These could then be exposed in oasis-node control status and also as Prometheus metrics (mentioned in #4425).

[kostko]

@gw0 Current health (for the current epoch if the node is in the executor committee) is already reported as part of the control status output (in 22.0.x) as the consensus layer is tracking liveness statistics. We will also be adding a Prometheus metric.