[TieredStorage] Use IndexOffset in TieredStorageMeta and get_account(… #69

Job	Run time
cargo-test-sbf (token/program)	6m 50s
check	0s
test	0s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	11m 24s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	7m 52s
cargo-test-sbf (token-upgrade/program)	7m 15s
cargo-test-sbf (feature-proposal/program)	6m 18s
cargo-test-sbf (governance/addin-mock/program, governance/program)	9m 57s
cargo-test-sbf (memo/program)	6m 27s
cargo-test-sbf (name-service/program)	6m 37s
cargo-test-sbf (stake-pool/program)	9m 3s
cargo-test-sbf (single-pool/program)	10m 26s
	1h 22m 9s

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