Implement EIP-7688: Forward compatible consensus data structures [WIP] #18153

Job	Run time
target-branch-check	1s
check-msrv	5m 2s
check-code	11m 0s
Check for 'skip-ci' label	3s
release-tests-windows	27m 51s
beacon-chain-tests	8m 32s
network-tests	15m 25s
debug-tests-ubuntu	15m 10s
op-pool-tests	19m 16s
release-tests-ubuntu	22m 57s
slasher-tests	3m 42s
state-transition-vectors-ubuntu	9m 48s
basic-simulator-ubuntu	21m 8s
cargo-udeps	7m 45s
cli-check	15m 46s
compile-with-beta-compiler	13m 40s
ef-tests-ubuntu	5m 39s
execution-engine-integration-ubuntu	12m 32s
fallback-simulator-ubuntu	18m 41s
test-suite-success	0s
	3h 53m 58s

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