Move SKTigonNetwork internal plugin to xplat

Summary: Moves SKTigonNetwork internal plugin to xplat leaving behind a stub buck target in litho

Reviewed By: passy

Differential Revision: D9082339

fbshipit-source-id: d98eeef4e64458586403c01937f6d48ad82e27aa

iOS/Plugins/Facebook/SKTigonNetworkPlugin/SKTigonNetworkPluginTestUtils/SKTigonNetworkPluginMock.mm

@@ -0,0 +1,17 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+#if FB_SONARKIT_ENABLED
+
+#import "SKTigonNetworkPluginMock.h"
+
+#import "SKDispatchQueueMock.h"
+
+@implementation SKTigonNetworkPluginMock
+
+- (instancetype)initWithNetworkAdapter:(id<SKNetworkAdapterDelegate>)adapter {
+  return [super initWithNetworkAdapter:adapter queue:std::make_shared<facebook::sonar::SyncQueue>()];
+}
+
+@end
+
+#endif