refactor: migrate `WidgetsBindingObserver` to `AppLifecycleListener` #81

Job	Run time
Test Flutter stable on ubuntu-latest	2m 34s
Test Flutter stable on macos-latest	5m 32s
Test Flutter stable on windows-latest	5m 4s
Test Flutter beta on ubuntu-latest	2m 30s
Test Flutter beta on macos-latest	4m 26s
Test Flutter beta on windows-latest	5m 27s
	25m 33s

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