Modularize beacon processor scheduler #18582

Job	Run time
check-code	9m 23s
check-msrv	4m 59s
Check for 'skip-ci' label	1s
target-branch-check	1s
op-pool-tests	15m 37s
beacon-chain-tests	28m 44s
network-tests	1m 28s
release-tests-ubuntu	28m 44s
release-tests-windows	28m 25s
basic-simulator-ubuntu	13m 21s
cargo-udeps	7m 21s
debug-tests-ubuntu	12m 22s
ef-tests-ubuntu	5m 48s
execution-engine-integration-ubuntu	13m 51s
fallback-simulator-ubuntu	10m 59s
slasher-tests	1m 28s
state-transition-vectors-ubuntu	2m 12s
cli-check	8m 1s
compile-with-beta-compiler	14m 1s
test-suite-success	1s
	3h 26m 47s

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