Mixed mode splicing #21183

Job	Run time
check_docs	3m 44s
ext-test	8m 4s
check_release	2m 52s
benchmark	17m 2s
fuzz	3m 41s
build (self-hosted, stable)	13m 59s
build (self-hosted, 1.75.0)	9m 52s
build (windows-latest, stable)	19m 4s
build-tx-sync (ubuntu-latest, beta)	4m 46s
build-tx-sync (macos-latest, stable)	9m 7s
build (macos-latest, 1.75.0)	17m 9s
build-tx-sync (ubuntu-latest, 1.75.0)	5m 29s
build (macos-latest, stable)	14m 29s
linting	2m 43s
build-tx-sync (macos-latest, beta)	5m 18s
build-tx-sync (macos-latest, 1.75.0)	5m 8s
rustfmt	14s
build (self-hosted, beta)	13m 58s
build-tx-sync (ubuntu-latest, stable)	4m 33s
coverage	0s
	2h 41m 12s

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