WIP custody lookup sync #204

Job	Run time
basic-simulator-ubuntu	1m 53s
beacon-chain-tests	24m 9s
check-code	1m 12s
cargo-udeps	5m 31s
check-msrv	3m 42s
cli-check	3m 42s
compile-with-beta-compiler	8m 5s
debug-tests-ubuntu	1m 23s
dockerfile-ubuntu	8m 20s
doppelganger-protection-test	2m 55s
execution-engine-integration-ubuntu	14m 7s
fallback-simulator-ubuntu	1m 35s
ef-tests-ubuntu	27m 14s
network-tests	2m 9s
op-pool-tests	15m 22s
release-tests-ubuntu	1m 43s
slasher-tests	1m 22s
target-branch-check	1s
state-transition-vectors-ubuntu	4m 11s
test-suite-success	1s
	2h 8m 37s

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