Move the RCTAppsetuUtils to AppDelegate

Summary:
This change solve a Circular Dependency where
- `React-Core` depends on `ReactCommon` because `RCTAppSetupUtils.h` (in Core) imports the `RCTTurboModuleManager` (from ReactCommon)
- `RCTTurboModuleManager` in `ReactCommon` depends on `React-Core` because it imports several classes from it (e.g. the `RCTBridge` class)

## Changelog:
[iOS][Breaking] - Moved the RCTAppSetupUtils to the AppDelegate library to break a dependency cycle

Reviewed By: sammy-SC, dmytrorykun

Differential Revision: D43089183

fbshipit-source-id: d7fc36a50811962caf7cff77bb45d42b8cdd4575

Libraries/AppDelegate/RCTAppDelegate.mm

@@ -6,8 +6,8 @@
  */
 
 #import "RCTAppDelegate.h"
-#import <React/RCTAppSetupUtils.h>
 #import <React/RCTRootView.h>
+#import "RCTAppSetupUtils.h"
 
 #if RCT_NEW_ARCH_ENABLED
 #import <React/CoreModulesPlugins.h>