sdk: setup KVStore.

sdk/kvstore/interface.go

@@ -0,0 +1,16 @@
+package kvstore
+
+// KVStore is a simple key-value store interface
+type KVStore interface {
+	// Get retrieves a value for a given key. Returns nil if not found.
+	Get(key []byte) ([]byte, error)
+	
+	// Set stores a value for a given key
+	Set(key []byte, value []byte) error
+	
+	// Delete removes a key and its value
+	Delete(key []byte) error
+	
+	// Close releases any resources held by the store
+	Close() error
+}