restructure shared state between StateStore and BufferedState #71286

Job	Run time
file_change_determinator	9s
rust-doc-tests	0s
rust-unit-tests	0s
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-lints	3m 44s
rust-cargo-deny	1m 40s
rust-check-merge-base	1m 26s
general-lints	29s
rust-cryptohasher-domain-separation-check	0s
rust-smoke-tests	0s
rust-targeted-unit-tests	10m 37s
rust-build-cached-packages	0s
	18m 5s

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