feat(sample): implement ImageReadMode (#1307)

* feat: implement TextureFrame.ReadTextureOnCPU

* feat: implement ImageReadMode for FaceDetectorRunner

* feat: implement ImageReadMode for FaceLandmarkerRunner

* feat: implement ImageReadMode for HandLandmarkerRunner

* feat: implement ImageReadMode for ImageSegmenterRunner

* feat: implement ImageReadMode for ObjectDetectorRunner

* feat: implement ImageReadMode for PoseLandmarkerRunner

* feat: read input synchronously when running MediaPipeVideoGraph

Author: homuler

Assets/MediaPipeUnity/Samples/Common/Scripts/ImageReadMode.cs

@@ -0,0 +1,18 @@
+// Copyright (c) 2025 homuler
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+using System.ComponentModel;
+
+namespace Mediapipe.Unity
+{
+  [System.Serializable]
+  public enum ImageReadMode
+  {
+    CPU,
+    [Description("CPU Async")]
+    CPUAsync,
+    GPU,
+  }
+}