SDK: Slot Hashes: Add queries using `sol_get_sysvar` #5839

Job	Run time
cargo-test-sbf (token/program)	9m 54s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	14m 46s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	11m 23s
check	3m 25s
cargo-test-sbf (token-upgrade/program)	9m 13s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	18m 1s
cargo-test-sbf (feature-proposal/program)	8m 17s
test (single-pool/cli, single-pool/program)	17m 46s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 31s
test (token-upgrade/cli, token-upgrade/program)	16m 20s
cargo-test-sbf (memo/program)	10m 10s
cargo-test-sbf (name-service/program)	8m 8s
cargo-test-sbf (stake-pool/program)	11m 36s
cargo-test-sbf (single-pool/program)	12m 14s
	2h 43m 44s

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