[Merged by Bors] - Use forwards iterator for state root lookups#2422

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macladson wants to merge 5 commits intosigp:unstablefrom macladson:forwards-iter-state-roots

+283-84

Commits on Jun 28, 2021

Use forward iteraters for state root lookups
macladson
committed

Commits on Jun 29, 2021

Apply head state root instead of head block root
macladson
committed

Commits on Jul 1, 2021