setBadgeNumber blocks the app on startup since iOs 12

[ColDrekken]

Hi !
I have a problem on iOS since iOS 12. The plugin causes an abnormal loading time when startup.

To Reproduce

run the app on ios 12+

run on ios 12 or ios 12.+
Expected behavior
I wish there was no blocking for several seconds

Console Logs

Main Thread Checker: UI API called on a background thread: -[UIApplication setApplicationIconBadgeNumber:]
PID: 17006, TID: 3973410, Thread name: (none), Queue name: com.apple.root.default-qos, QoS: 0
Backtrace:
4 BaseChat 0x0000000100e09f04 __33-[FirebasePlugin setBadgeNumber:]_block_invoke + 104
5 libdispatch.dylib 0x00000001023df1f8 _dispatch_call_block_and_release + 32
6 libdispatch.dylib 0x00000001023e0778 _dispatch_client_callout + 20
7 libdispatch.dylib 0x00000001023e3720 _dispatch_queue_override_invoke + 912
8 libdispatch.dylib 0x00000001023f1a34 _dispatch_root_queue_drain + 352
9 libdispatch.dylib 0x00000001023f243c _dispatch_worker_thread2 + 144
10 libsystem_pthread.dylib 0x00000001fc078b38 _pthread_wqthread + 468
11 libsystem_pthread.dylib 0x00000001fc07edc4 start_wqthread + 4
2019-07-04 12:56:24.587723+0200 BaseChat[17006:3973410] [reports] Main Thread Checker: UI API called on a background thread: -[UIApplication setApplicationIconBadgeNumber:]
PID: 17006, TID: 3973410, Thread name: (none), Queue name: com.apple.root.default-qos, QoS: 0
Backtrace:
4 BaseChat 0x0000000100e09f04 __33-[FirebasePlugin setBadgeNumber:]_block_invoke + 104
5 libdispatch.dylib 0x00000001023df1f8 _dispatch_call_block_and_release + 32
6 libdispatch.dylib 0x00000001023e0778 _dispatch_client_callout + 20
7 libdispatch.dylib 0x00000001023e3720 _dispatch_queue_override_invoke + 912
8 libdispatch.dylib 0x00000001023f1a34 _dispatch_root_queue_drain + 352
9 libdispatch.dylib 0x00000001023f243c _dispatch_worker_thread2 + 144
10 libsystem_pthread.dylib 0x00000001fc078b38 _pthread_wqthread + 468
11 libsystem_pthread.dylib 0x00000001fc07edc4 start_wqthread + 4

Plugin Version
cordova-plugin-firebase-lib 3.3.0

Smartphone (please complete the following information):

Device: iPhone SE | iPhone6 | iPhone6+ IphoneX/XS
OS: iOS 12 | iOS 12.x
Additional context

[sagrawal31]

Will take a look.