Prevent using local notification plugin to change the sound of notification

[erfanjazebnikoo]

There is a parameter in the displayNotification method to control the sound of notification. It requires the flutter_local_notification plugin inside our project to change it. It's not cool to use both plugins because we are using this plugin to facilitate the implementation and, also, it made a lot of dependency incompatibility. Could you use a boolean param instead of this object to handle the sound of notification?

[mo-ah-dawood]

This package main task is mixing between firebase_messaging & flutter_local_notification so its important to use flutter_local_notification to display locale notifications