WIP Add LedgerStateCache #6700

Job	Run time
fmt	14s
build (gcc, current)	1h 22m 40s
rust-check-git-rev-deps	20s
build (gcc, current, --check-test-tx-meta)	1h 1m 5s
cargo-deny (advisories)	45s
cargo-deny (bans licenses sources)	46s
build (gcc, next)	1h 21m 36s
build (gcc, next, --check-test-tx-meta)	1h 3m 53s
build (clang, current)	55m 1s
build (clang, current, --check-test-tx-meta)	52m 24s
build (clang, next)	1h 2m 7s
build (clang, next, --check-test-tx-meta)	56m 35s
complete	1s
	8h 37m 27s

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