Swift support for NetworkPlugin (#201)

Summary:
Solves #173

- [x] Add plugins in the sonarkit xcodeproj so that its easy to debug
- [x] Get rid off the c++ in the headers
- [x] Add example to hit network requests and validate

Have a look at the screen shot below ✨⭐️⚡️

<img width="1677" alt="screen shot 2018-08-02 at 12 46 07 pm" src="https://user-images.githubusercontent.com/3865908/43581809-22efe4fe-9652-11e8-9424-f279d07c5c81.png">
Pull Request resolved: https://github.com/facebook/flipper/pull/201

Reviewed By: danielbuechele

Differential Revision: D9132157

Pulled By: priteshrnandgaonkar

fbshipit-source-id: 2b425506961f02eb2bf629c2bcab0da6e7ce5bb0

iOS/Plugins/SonarKitNetworkPlugin/SonarKitNetworkPlugin/SKBufferingPlugin+CPPInitialization.h

@@ -0,0 +1,29 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+#if FB_SONARKIT_ENABLED
+#pragma once
+
+#import "SKBufferingPlugin.h"
+#import "SKDispatchQueue.h"
+#import <iostream>
+#import <memory>
+
+struct CachedEvent {
+  NSString *method;
+  NSDictionary<NSString *, id> *sonarObject;
+};
+
+
+@interface SKBufferingPlugin(CPPInitialization)
+
+- (instancetype)initWithVectorEventSize:(NSUInteger)size connectionAccessQueue:(std::shared_ptr<facebook::sonar::DispatchQueue>)connectionAccessQueue;
+- (instancetype)initWithDispatchQueue:(std::shared_ptr<facebook::sonar::DispatchQueue>)queue;
+
+@end
+
+#endif