blockstore: scaffolding for chained merkle root conflict detection #2029

Job	Run time
clippy-nightly (macos-latest-large)	11m 35s
clippy-nightly (windows-latest)	25m 6s
clippy-stable (macos-latest-large)	12m 13s
clippy-stable (windows-latest)	25m 55s
	1h 14m 49s

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