Added iOS task options protocol

mediapipe/tasks/ios/core/sources/MPPTaskOptionsProtocol.h

@@ -0,0 +1,32 @@
+// Copyright 2022 The MediaPipe Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <Foundation/Foundation.h>
+#include "mediapipe/framework/calculator_options.pb.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * Any mediapipe task options should confirm to this protocol.
+ */
+@protocol MPPTaskOptionsProtocol
+
+/**
+ * Copies the iOS Mediapipe task options to an object of mediapipe::CalculatorOptions proto.
+ */
+- (void)copyToProto:(mediapipe::CalculatorOptions *)optionsProto;
+
+@end
+
+NS_ASSUME_NONNULL_END