input: | chainID | height | appHash | curValidatorSetHash | [{validator pubkey, voting power}] | | 32 bytes | 8 bytes | 32 bytes | 32 bytes | [{32 bytes, 8 bytes}] |.

input: | storeName | key length | key | value length | value | appHash | proof | | 32 bytes | 32 bytes | | 32 bytes | | 32 bytes | |.

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.

RequireProof return whether proof is require for the subpath.

the multi-store proof operation constant value.

CommitID contains the tree version number and its merkle root.

NOTE: Keep CommitInfo a simple immutable struct.

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

TODO: document.

StoreInfo contains the name and core reference for an underlying store.