Blockstore: Migrate ShredIndex type to more efficient data structure #16172

Job	Run time
cargo-test-sbf (associated-token-account)	2m 10s
check (associated-token-account)	1m 19s
test_cli (single-pool)	2m 11s
cargo-test-sbf (feature-proposal)	2m 11s
check (feature-proposal)	2m 9s
test_cli (token-2022)	2m 12s
cargo-test-sbf (instruction-padding)	2m 10s
check (instruction-padding)	2m 7s
cargo-test-sbf (memo)	2m 11s
check (memo)	1m 57s
cargo-test-sbf (record)	2m 8s
check (record)	1m 7s
cargo-test-sbf (single-pool)	2m 10s
cargo-test-sbf (slashing)	2m 9s
check (single-pool)	2m 8s
cargo-test-sbf (stake-pool)	2m 11s
check (slashing)	1m 30s
check (stake-pool)	2m 9s
cargo-test-sbf (token-2022)	2m 10s
check (token-2022)	2m 11s
	40m 30s

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