UI 자동화를 위해 바인딩 기능 구현

- 유니티 에셋 인증 오류로 meta 재생성

Packages/com.unity.inputsystem/InputSystem/Plugins/WebGL/WebGLJoystick.cs

@@ -0,0 +1,12 @@
+#if UNITY_WEBGL || UNITY_EDITOR || PACKAGE_DOCS_GENERATION
+
+namespace UnityEngine.InputSystem.WebGL
+{
+    /// <summary>
+    /// A Joystick or Gamepad on WebGL that does not have any known mapping.
+    /// </summary>
+    public class WebGLJoystick : Joystick
+    {
+    }
+}
+#endif // UNITY_WEBGL || UNITY_EDITOR