Add old callback for external user id auth (#809)

Author: Jeasmine

iOS_SDK/OneSignalSDK/Source/OneSignal.h

@@ -585,13 +585,16 @@ typedef void (^OSEmailSuccessBlock)();
 
 // External user id
 // Typedefs defining completion blocks for updating the external user id
+typedef void (^OSUpdateExternalUserIdBlock)(NSDictionary* results);
 typedef void (^OSUpdateExternalUserIdFailureBlock)(NSError *error);
 typedef void (^OSUpdateExternalUserIdSuccessBlock)(NSDictionary *results);
 
 + (void)setExternalUserId:(NSString * _Nonnull)externalId;
++ (void)setExternalUserId:(NSString * _Nonnull)externalId withCompletion:(OSUpdateExternalUserIdBlock _Nullable)completionBlock;
 + (void)setExternalUserId:(NSString * _Nonnull)externalId withSuccess:(OSUpdateExternalUserIdSuccessBlock _Nullable)successBlock withFailure:(OSUpdateExternalUserIdFailureBlock _Nullable)failureBlock;
 + (void)setExternalUserId:(NSString *)externalId withExternalIdAuthHashToken:(NSString *)hashToken withSuccess:(OSUpdateExternalUserIdSuccessBlock _Nullable)successBlock withFailure:(OSUpdateExternalUserIdFailureBlock _Nullable)failureBlock;
 + (void)removeExternalUserId;
++ (void)removeExternalUserId:(OSUpdateExternalUserIdBlock _Nullable)completionBlock;
 + (void)removeExternalUserId:(OSUpdateExternalUserIdSuccessBlock _Nullable)successBlock withFailure:(OSUpdateExternalUserIdFailureBlock _Nullable)failureBlock;
 
 // In-App Messaging triggers

iOS_SDK/OneSignalSDK/Source/OneSignal.m

@@ -2622,6 +2622,10 @@ + (void)setExternalUserId:(NSString * _Nonnull)externalId {
     [self setExternalUserId:externalId withSuccess:nil withFailure:nil];
 }
 
++ (void)setExternalUserId:(NSString *)externalId withCompletion:(OSUpdateExternalUserIdBlock)completionBlock {
+    [self setExternalUserId:externalId withSuccess:completionBlock withFailure:nil];
+}
+
 + (void)setExternalUserId:(NSString * _Nonnull)externalId withSuccess:(OSUpdateExternalUserIdSuccessBlock _Nullable)successBlock withFailure:(OSUpdateExternalUserIdFailureBlock _Nullable)failureBlock {
     // return if the user has not granted privacy permissions
     if ([self shouldLogMissingPrivacyConsentErrorWithMethodName:@"setExternalUserId:withSuccess:withFailure:"])
@@ -2692,6 +2696,10 @@ + (void)removeExternalUserId {
     [self setExternalUserId:@""];
 }
 
++ (void)removeExternalUserId:(OSUpdateExternalUserIdBlock)completionBlock {
+    [self removeExternalUserId:completionBlock withFailure:nil];
+}
+
 + (void)removeExternalUserId:(OSUpdateExternalUserIdSuccessBlock _Nullable)successBlock withFailure:(OSUpdateExternalUserIdFailureBlock _Nullable)failureBlock {
     // return if the user has not granted privacy permissions
     if ([self shouldLogMissingPrivacyConsentErrorWithMethodName:@"removeExternalUserId:"])