In-memory tree states #16119

Job	Run time
beacon-chain-tests	17m 3s
cargo-udeps	6m 27s
check-code	9m 43s
cli-check	17m 28s
check-msrv	4m 11s
compile-with-beta-compiler	14m 58s
dockerfile-ubuntu	13m 42s
debug-tests-ubuntu	11m 32s
doppelganger-protection-test	25m 24s
ef-tests-ubuntu	12m 8s
eth1-simulator-ubuntu	29m 21s
execution-engine-integration-ubuntu	9m 23s
merge-transition-ubuntu	29m 29s
network-tests	17m 25s
no-eth1-simulator-ubuntu	27m 46s
op-pool-tests	21m 36s
release-tests-ubuntu	23m 30s
release-tests-windows	29m 10s
slasher-tests	5m 18s
syncing-simulator-ubuntu	23m 3s
state-transition-vectors-ubuntu	11m 4s
target-branch-check	1s
test-suite-success	5s
	5h 59m 47s

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