v1.18: shred: expose chained merkle root (backport of #435) #1397

Job	Run time
check	0s
cargo-test-sbf (token/program)	9m 25s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 13s
test	0s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 20s
cargo-test-sbf (token-upgrade/program)	8m 43s
cargo-test-sbf (feature-proposal/program)	9m 13s
cargo-test-sbf (governance/addin-mock/program, governance/program)	13m 57s
cargo-test-sbf (memo/program)	7m 58s
cargo-test-sbf (name-service/program)	9m 26s
cargo-test-sbf (stake-pool/program)	12m 27s
cargo-test-sbf (single-pool/program)	9m 17s
	1h 45m 59s

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