MigrateValue is a helper function that migrates values stored in a KV store for the given key prefix using the given value migrator function.

IHeightPatch defines an interface for a non-software upgrade proposal Height Patch at a given height to implement.

IUpgrade defines an interface to run a SoftwareUpgradeProposal.

ValueMigrator migrates a value to the new protobuf type given its old protobuf serialized bytes.