Block: extract static Header constructors #11385

Job	Run time
vm-api	3m 15s
vm-benchmarks	2m 25s
vm-blockchain (--fork=Berlin --verify-test-amount-alltests)	10m 56s
vm-blockchain (--fork=London --verify-test-amount-alltests)	12m 52s
vm-state (Berlin)	8m 22s
vm-blockchain (--fork=Paris --verify-test-amount-alltests)	13m 9s
vm-state (London)	9m 0s
vm-blockchain (--fork=Shanghai --verify-test-amount-alltests)	12m 46s
vm-state (Paris)	9m 17s
vm-blockchain (--fork=Cancun --verify-test-amount-alltests)	15m 55s
vm-state (Shanghai)	9m 29s
vm-state (Cancun)	10m 43s
vm-blockchain-extended	0s
vm-state-extended	0s
	1h 58m 9s

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