Permission requests synchronization

[xpathexception]

If couple of permission requests run in different scopes in parallel, at least one request will fail with an exception.

W/Activity: Can request only one set of permissions at a time
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: dev.icerock.moko.samples.permissions.debug, PID: 27897
    java.util.NoSuchElementException: Array is empty.
        at kotlin.collections.ArraysKt___ArraysKt.first(_Arrays.kt:1013)
        at dev.icerock.moko.permissions.ResolverFragment.onRequestPermissionsResult(ResolverFragment.kt:54)
        at androidx.fragment.app.FragmentActivity.onRequestPermissionsResult(FragmentActivity.java:769)
        ...

Simpliest example of such case may look like that:

SampleViewModel.kt

private fun requestPermission() {
    viewModelScope.launch {
        try {
            // Calls suspend function in a coroutine to request some permission.
            permissionsController.providePermission(Permission.RECORD_AUDIO)
            // If there are no exceptions, permission has been granted successfully.
            eventsDispatcher.dispatchEvent { onSuccess() }
        } catch (deniedAlwaysException: DeniedAlwaysException) {
            eventsDispatcher.dispatchEvent { onDeniedAlways(deniedAlwaysException) }
        } catch (deniedException: DeniedException) {
            eventsDispatcher.dispatchEvent { onDenied(deniedException) }
        }
    }
    viewModelScope.launch {
        try {
            // Calls suspend function in a coroutine to request some permission.
            permissionsController.providePermission(Permission.CAMERA)
            // If there are no exceptions, permission has been granted successfully.
            eventsDispatcher.dispatchEvent { onSuccess() }
        } catch (deniedAlwaysException: DeniedAlwaysException) {
            eventsDispatcher.dispatchEvent { onDeniedAlways(deniedAlwaysException) }
        } catch (deniedException: DeniedException) {
            eventsDispatcher.dispatchEvent { onDenied(deniedException) }
        }
    }
}

In real-world cases this may be caused, for example, by requesting couple of different permissions in separate application modules. Moreover, LocationTracker from moko-geo is affected too.

Although problem can be solved by providing synchronization manually, it wold be nice to implement this in library. I think the best possible option is synchronize request across all PermissionController instances, but it will be great to have such thing for at least one instance.