Consistently use `wire::Message` for encoding #21205

Job	Run time
linting	2m 24s
benchmark	16m 30s
rustfmt	13s
ext-test	7m 47s
fuzz	1h 8m 18s
check_release	2m 43s
build (windows-latest, stable)	2h 16m 43s
check_docs	3m 41s
build (self-hosted, stable)	1h 23m 11s
build (macos-latest, stable)	2h 14m 51s
build (self-hosted, beta)	1h 16m 28s
build (macos-latest, 1.75.0)	1h 45m 3s
build-tx-sync (ubuntu-latest, stable)	4m 50s
build (self-hosted, 1.75.0)	1h 19m 32s
build-tx-sync (ubuntu-latest, 1.75.0)	5m 13s
build-tx-sync (macos-latest, 1.75.0)	6m 54s
build-tx-sync (macos-latest, beta)	6m 54s
build-tx-sync (macos-latest, stable)	5m 52s
build-tx-sync (ubuntu-latest, beta)	4m 48s
coverage	43m 58s
	13h 15m 53s

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