[Splicing] Clone for ChannelContext #16836

Job	Run time
build-tx-sync (ubuntu-latest, stable)	4m 46s
build-tx-sync (ubuntu-latest, beta)	4m 23s
build (ubuntu-latest, stable)	1h 5m 12s
build-tx-sync (ubuntu-latest, 1.75.0)	4m 41s
build (ubuntu-latest, beta)	1h 5m 22s
build-tx-sync (macos-latest, stable)	4m 35s
build (ubuntu-latest, 1.63.0)	1h 28m 48s
build-tx-sync (macos-latest, beta)	5m 2s
build (windows-latest, stable)	2h 2m 10s
build-tx-sync (macos-latest, 1.75.0)	4m 12s
build (windows-latest, beta)	1h 55m 58s
build (macos-latest, stable)	1h 5m 59s
benchmark	18m 2s
check_commits	4m 53s
check_release	1m 58s
build (macos-latest, beta)	59m 54s
coverage	8m 16s
build (macos-latest, 1.63.0)	1h 12m 7s
fuzz	6h 0m 15s
linting	59s
rustfmt	13s
incremental-mutants	1h 51m 35s
	19h 49m 20s

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