refactor(core): structural typing for kvstore

core/store/store.go

@@ -1,7 +1,7 @@
 package store
 
 // KVStore describes the basic interface for interacting with key-value stores.
-type KVStore interface {
+type KVStore = interface {
 	// Get returns nil iff key doesn't exist. Errors on nil key.
 	Get(key []byte) ([]byte, error)