statemanager: cache and other refactors #11492

Job	Run time
vm-api	3m 20s
vm-state (Berlin)	3m 0s
vm-state (London)	2m 58s
vm-state (Paris)	2m 54s
vm-state (Shanghai)	2m 52s
vm-benchmarks	2m 28s
vm-state (Cancun)	2m 55s
vm-blockchain (--fork=Berlin --verify-test-amount-alltests)	2m 27s
vm-blockchain-extended	0s
vm-blockchain (--fork=London --verify-test-amount-alltests)	2m 52s
vm-blockchain (--fork=Paris --verify-test-amount-alltests)	2m 17s
vm-state-extended	0s
vm-blockchain (--fork=Shanghai --verify-test-amount-alltests)	2m 16s
vm-blockchain (--fork=Cancun --verify-test-amount-alltests)	2m 22s
	32m 41s

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