Builder and beacon API updates for Sidecar inclusion proofs #217

Job	Run time
cargo-udeps	6m 11s
check-code	7m 23s
check-msrv	8m 5s
beacon-chain-tests	44m 6s
compile-with-beta-compiler	7m 51s
debug-tests-ubuntu	20m 0s
dockerfile-ubuntu	15m 43s
doppelganger-protection-test	33m 37s
ef-tests-ubuntu	18m 49s
eth1-simulator-ubuntu	28m 30s
execution-engine-integration-ubuntu	15m 46s
merge-transition-ubuntu	28m 39s
network-tests	11m 26s
no-eth1-simulator-ubuntu	30m 36s
op-pool-tests	21m 21s
release-tests-ubuntu	44m 24s
slasher-tests	6m 42s
release-tests-windows	1h 20m 33s
state-transition-vectors-ubuntu	12m 15s
syncing-simulator-ubuntu	23m 32s
target-branch-check	1s
	7h 45m 30s

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