feat(android,interface): Implement video thumbnail generation

packages/moxplatform_platform_interface/lib/src/api.g.dart

@@ -756,6 +756,36 @@ class MoxplatformApi {
     }
   }
 
+  /// Media APIs
+  Future<bool> generateVideoThumbnail(
+      String arg_src, String arg_dest, int arg_maxWidth) async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.moxplatform_platform_interface.MoxplatformApi.generateVideoThumbnail',
+        codec,
+        binaryMessenger: _binaryMessenger);
+    final List<Object?>? replyList = await channel
+        .send(<Object?>[arg_src, arg_dest, arg_maxWidth]) as List<Object?>?;
+    if (replyList == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyList.length > 1) {
+      throw PlatformException(
+        code: replyList[0]! as String,
+        message: replyList[1] as String?,
+        details: replyList[2],
+      );
+    } else if (replyList[0] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (replyList[0] as bool?)!;
+    }
+  }
+
   /// Stubs
   Future<void> eventStub(NotificationEvent arg_event) async {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(

packages/moxplatform_platform_interface/lib/src/platform.dart

@@ -12,4 +12,9 @@ abstract class PlatformImplementation {
   /// Opens the page for battery optimisations. If not supported on the
   /// platform, does nothing.
   Future<void> openBatteryOptimisationSettings();
+
+  /// Attempt to generate a thumbnail for the video file at [src], scale it, while keeping the
+  /// aspect ratio in tact to [width], and write it to [dest]. If we were successful, returns true.
+  /// If no thumbnail was generated, returns false.
+  Future<bool> generateVideoThumbnail(String src, String dest, int width);
 }

packages/moxplatform_platform_interface/lib/src/platform_stub.dart

@@ -14,4 +14,9 @@ class StubPlatformImplementation extends PlatformImplementation {
 
   @override
   Future<void> openBatteryOptimisationSettings() async {}
+
+  @override
+  Future<bool> generateVideoThumbnail(
+          String src, String dest, int width) async =>
+      false;
 }