Backport Bitcoin PRs #6589, #7180 and remaining part of #7181: enable per-command byte counters in CNode
#1496
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This PR contains changes that enable per-command byte counters in
CNodethat can be accessed usinggetpeerinfoRPC call.This is backport of 3 Bitcoin PRs:
sendheadersverackmessages bitcoin/bitcoin#7180,Note that third commit partially cancel first one, so I'd recommend reviewing total change, not per-commit ones.
This is the first in series of PRs for big networking refactoring. Although it's not strictly necessary, it makes further refactoring easier because some subsequent changes touch parts of code affected by these changes.