fix(app-check, ios): remove import loop to fix protocol def warning

import loops can apparently be the root cause of protocol definition issues,
and if you ensure imports only happen once by chaining correctly then protocol
definitions are found correctly and the warning goes away

Author: mikehardy

packages/app-check/ios/RNFBAppCheck/RNFBAppCheckModule.m

@@ -16,13 +16,13 @@
  */
 
 #import <Firebase/Firebase.h>
+#import <FirebaseAppCheck/FIRAppCheck.h>
+
 #import <React/RCTUtils.h>
 
 #import "RNFBApp/RNFBSharedUtils.h"
 #import "RNFBAppCheckModule.h"
 
-#import "FirebaseAppCheck/FIRAppCheck.h"
-
 @implementation RNFBAppCheckModule
 #pragma mark -
 #pragma mark Module Setup

packages/app-check/ios/RNFBAppCheck/RNFBAppCheckProviderFactory.h

@@ -15,7 +15,7 @@
  *
  */
 
-#import <FirebaseAppCheck/FIRAppCheck.h>
+#import "RNFBAppCheckProvider.h"
 
 @interface RNFBAppCheckProviderFactory : NSObject <FIRAppCheckProviderFactory>
 

packages/app-check/ios/RNFBAppCheck/RNFBAppCheckProviderFactory.m

@@ -16,10 +16,7 @@
  */
 
 #import "RNFBAppCheckProviderFactory.h"
-#import <Firebase/Firebase.h>
-#import <FirebaseAppCheck/FIRAppCheck.h>
 #import "RNFBApp/RNFBSharedUtils.h"
-#import "RNFBAppCheckProvider.h"
 
 @implementation RNFBAppCheckProviderFactory