Merge PR #60220 into wip-pdonnell-testing-20241019.005706-debug

* refs/pull/60220/head:
	msg/async/AsyncConnection: move the writeCallback instead of copying it
	msg/async/AsyncConnection: do not wrap writeCallback in `std::optional`
	msg/async/frames_v2: use zero-initialization instead of memset()
	msg/async/Event: use zero-initialization instead of memset()
	msg/Message: use zero-initialization instead of memset()
	msg/async/ProtocolV2: eliminate redundant std::map lookups
	msg/async/ProtocolV[12]: reverse the std::map sort order
	msg/async/ProtocolV[12]: use `auto`
	msg/async/ProtocolV[12]: use range-based `for`
	msg/async/ProtocolV1: use zero-initialization instead of memset()