Broadcast TurboModule creation

Summary:
When TurboModules are created, we need to broadcast this event using `NSNotificationCenter`. This is important because a number of TurboModules/ObjC classes listen to this notification and perform side effects.

I found these using https://fburl.com/codesearch/j0a9p3dr.
- FBReactKitServerSnapshotTests: After the RCTExceptionsManager is initialized, it assigns itself as the delegate to the RCTExceptionsManager instance.
- FBProfilePictureUploadFlowController: After FBProfileFrameNativeModule is initialized, it calls `[module setFlowController: self]`
- RCTFBSession: After every NativeModule is initialized, if that NativeModule conforms to the RCTFBSessionModule protocol, assign the session to it.
- TwilightLocalMedia: Hack to figure out when the bridge is initialized.
- FBMarketplaceMenuItemHandler: After FBMarketplaceNativeModule is initialized, attach a data source obtained from the session to the module. Then, attach module to data source.
- RCTModuleInitTests: Set local state based on if certain modules are initialized (https://fburl.com/e34kezb5).
- IGReactModule: When the RCTImageLoader is initialized, set it's image cache to `[IGReactImageCache new]`.
- RCTIGUserSession: Like RCTFBSession
- FBReactModuleTracker: This keeps a list of all dispatched notifications (for some reason).
- RCTModuleInitNotificationRaceTests: Sets self.didDetectViewManagerInit to true if RCTTestViewManager is initialized.

Reviewed By: fkgozali

Differential Revision: D14281557

fbshipit-source-id: 9fcf1bb5f5650fcc3a3e50c6d93405b0b618e271

ReactCommon/turbomodule/core/platform/ios/RCTTurboModuleManager.mm

@@ -9,6 +9,7 @@
 
 #import <cassert>
 
+#import <React/RCTBridge+Private.h>
 #import <React/RCTBridgeModule.h>
 #import <React/RCTCxxModule.h>
 #import <React/RCTLog.h>
@@ -230,6 +231,16 @@ static Class getFallbackClassFromName(const char *name) {
   }
 
   _rctTurboModuleCache.insert({moduleName, module});
+
+  /**
+   * Broadcast that this TurboModule was created.
+   *
+   * TODO(T41180176): Investigate whether we can get rid of this after all
+   * TurboModules are rolled out
+   */
+  [[NSNotificationCenter defaultCenter] postNotificationName:RCTDidInitializeModuleNotification
+                                                      object:_bridge.parentBridge
+                                                    userInfo:@{@"module": module, @"bridge": RCTNullIfNil(_bridge.parentBridge)}];
   return module;
 }