Start prototyping superstruct features #16123

Job	Run time
op-pool-tests	6m 9s
beacon-chain-tests	1m 17s
network-tests	5m 43s
release-tests-ubuntu	1m 35s
release-tests-windows	2m 15s
target-branch-check	2s
debug-tests-ubuntu	1m 30s
dockerfile-ubuntu	4m 15s
doppelganger-protection-test	2m 5s
ef-tests-ubuntu	1m 24s
eth1-simulator-ubuntu	5m 51s
execution-engine-integration-ubuntu	1m 34s
merge-transition-ubuntu	5m 59s
no-eth1-simulator-ubuntu	5m 46s
slasher-tests	4m 28s
state-transition-vectors-ubuntu	5m 56s
syncing-simulator-ubuntu	6m 6s
cargo-udeps	2m 48s
check-code	4m 25s
check-msrv	2m 29s
cli-check	7m 24s
compile-with-beta-compiler	4m 27s
test-suite-success	0s
	1h 23m 28s

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