Blockstore: Migrate ShredIndex type to more efficient data structure #16174

Job	Run time
test_cli (single-pool)	15m 25s
test_cli (token-2022)	16m 34s
check (associated-token-account)	1m 25s
cargo-test-sbf (associated-token-account)	8m 15s
check (feature-proposal)	2m 10s
cargo-test-sbf (feature-proposal)	7m 51s
check (instruction-padding)	1m 52s
cargo-test-sbf (instruction-padding)	7m 21s
check (memo)	2m 13s
cargo-test-sbf (memo)	6m 18s
check (record)	1m 37s
cargo-test-sbf (record)	6m 58s
check (single-pool)	2m 39s
cargo-test-sbf (single-pool)	8m 36s
check (slashing)	1m 23s
cargo-test-sbf (slashing)	14m 16s
check (stake-pool)	2m 24s
cargo-test-sbf (stake-pool)	10m 59s
cargo-test-sbf (token-2022)	8m 43s
check (token-2022)	4m 36s
	2h 11m 35s

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