XXX: This should be managed by the rootMultiStore which may want to register more proof ops?.

MultiStoreProofOpDecoder returns a multi-store merkle proof operator from a given proof operation.

nolint.

RequireProof returns whether proof is required for the subpath.

the multi-store proof operation constant value.

MultiStoreProof defines a collection of store proofs in a multi-store.

TODO: document.

Store is composed of many CommitStores.