feat(forkchoice): implement the forkchoice module (#246) #1389

Job	Run time
bindings - test	3m 26s
build & test (ubuntu-24.04-arm)	5m 19s
spec tests - prepare	1m 56s
build & test (ubuntu-latest)	4m 45s
build & test (macos-latest)	4m 16s
spec tests - ssz static mainnet	3m 42s
slow tests	5m 50s
spec tests - ssz static minimal	21m 17s
spec tests - mainnet (sanity)	8m 2s
spec tests - ssz generic	2m 57s
spec tests - bls	1m 46s
spec tests - mainnet (rewards)	5m 15s
spec tests - mainnet (epoch_processing)	6m 45s
spec tests - mainnet (transition)	5m 44s
spec tests - minimal (operations)	3m 31s
spec tests - minimal (epoch_processing)	2m 49s
spec tests - mainnet (operations)	11m 57s
spec tests - minimal (merkle_proof)	2m 59s
spec tests - minimal (fork)	2m 45s
build fuzz harnesses	2m 48s
spec tests - minimal (sanity)	2m 52s
spec tests - minimal (rewards)	3m 7s
spec tests - mainnet (fork)	5m 28s
spec tests - mainnet (random)	7m 15s
spec tests - mainnet (merkle_proof)	3m 42s
spec tests - minimal (random)	3m 40s
spec tests - minimal (transition)	3m 11s
spec tests - mainnet (finality)	4m 6s
spec tests - minimal (finality)	2m 49s
	2h 23m 59s

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