fix(block-sync): use avg latency to determine slow sync peer for block sync #3912
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Description
Uses average blocks received per second to determine slow sync peer.
Display average block receive time on status line
Motivation and Context
Esp. for large blocks, there could be a single large delay that would previously immediately cause the next peer to be attempted. Using the average blocks received per second, a "blip" in the latency will not cause the sync peer to switch.
How Has This Been Tested?
Manually