Add a warning if TurboModule init uses dispatch_sync for main queue

Summary:
When you require a TurboModule on thread that isn't the main thread, but the TurboModule requires main queue setup, we are forced to `dispatch_sync` the set up to the main queue. This is hazardous, because it can lead to deadlocks. Therefore, I'm migrating over a warning from the legacy infra that warns against this use-case.

Changelog: [Internal]

Reviewed By: fkgozali

Differential Revision: D21654637

fbshipit-source-id: 99dc45708c533603d2111fe6163d40e807d2a513

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

@@ -396,6 +396,12 @@ - (void)notifyAboutTurboModuleSetup:(const char *)name
       };
 
       if ([self _requiresMainQueueSetup:moduleClass]) {
+        if (!RCTIsMainQueue()) {
+          RCTLogWarn(
+              @"TurboModule \"%@\" requires synchronous dispatch onto the main queue to be initialized. This may lead to deadlock.",
+              moduleClass);
+        }
+
         RCTUnsafeExecuteOnMainQueueSync(work);
       } else {
         work();