Rename SonarState* to FlipperState*

Summary: Part of sonar to flipper rename

Reviewed By: passy

Differential Revision: D9919821

fbshipit-source-id: a44a2a04d5463750f884f8bf1328e02d56593e82

xplat/Flipper/FlipperStateUpdateListener.h

@@ -0,0 +1,14 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+
+#pragma once
+
+class FlipperStateUpdateListener {
+ public:
+  virtual void onUpdate() = 0;
+};