Add missing imports

Author: stuartmorgan-g

packages/camera/camera_avfoundation/example/ios/RunnerTests/CameraSettingsTests.swift

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import AVFoundation
+import Flutter
 import XCTest
 
 @testable import camera_avfoundation

packages/camera/camera_avfoundation/example/ios/RunnerTests/Mocks/MockCaptureDeviceInputFactory.swift

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import Foundation
+
 @testable import camera_avfoundation
 
 ///// A mocked implementation of CaptureDeviceInputFactory which allows injecting a custom

packages/camera/camera_avfoundation/example/ios/RunnerTests/Mocks/MockFrameRateRange.swift

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import Foundation
+
 @testable import camera_avfoundation
 
 /// A mock implementation of `FrameRateRange` that allows mocking the class properties.

packages/camera/camera_avfoundation/example/ios/RunnerTests/Mocks/MockWritableData.swift

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import Foundation
+
 @testable import camera_avfoundation
 
 /// A mock implementation of `WritableData` that allows injecting a custom implementation