simplifies blockstore Column::index implementations #16580

Job	Run time
cargo-test-sbf (associated-token-account)	12m 19s
cargo-test-sbf (feature-proposal)	16m 36s
check (associated-token-account)	2m 19s
test_cli (single-pool)	17m 18s
cargo-test-sbf (instruction-padding)	6m 30s
test_cli (token-2022)	16m 51s
cargo-test-sbf (memo)	13m 19s
cargo-test-sbf (record)	7m 14s
check (feature-proposal)	2m 24s
cargo-test-sbf (single-pool)	13m 22s
cargo-test-sbf (slashing)	20m 42s
check (instruction-padding)	6m 20s
cargo-test-sbf (stake-pool)	10m 34s
check (memo)	2m 5s
cargo-test-sbf (token-2022)	8m 18s
check (record)	2m 10s
check (single-pool)	7m 7s
check (slashing)	1m 22s
check (stake-pool)	6m 53s
check (token-2022)	14m 58s
	3h 8m 41s

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