restructure shared state between StateStore and BufferedState #71290

Job	Run time
file_change_determinator	12s
rust-doc-tests	5m 5s
rust-consensus-only-unit-test	0s
rust-consensus-only-smoke-test	0s
rust-unit-tests	0s
rust-cargo-deny	1m 47s
rust-lints	3m 36s
general-lints	28s
rust-cryptohasher-domain-separation-check	0s
rust-smoke-tests	30m 56s
rust-build-cached-packages	1m 58s
rust-check-merge-base	1m 26s
rust-targeted-unit-tests	19m 57s
	1h 5m 25s

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