restructure shared state between StateStore and BufferedState #71310

Job	Run time
file_change_determinator	11s
rust-doc-tests	5m 19s
rust-unit-tests	0s
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-cargo-deny	1m 55s
rust-lints	3m 35s
rust-smoke-tests	30m 15s
general-lints	26s
rust-check-merge-base	1m 31s
rust-cryptohasher-domain-separation-check	0s
rust-build-cached-packages	2m 5s
rust-targeted-unit-tests	18m 35s
	1h 3m 52s

Provide feedback