Hive.init does not return future

I am using hive on dart native so I am initializing Hive using `Hive.init()`
but using flutter the init does return future `await Hive.initFlutter();`.

Is there no need for hive initializing in dart native to return future?.
If this is an async that returns void the programmer does not have an efficient way to continue his program and make sure the process is complete, he can use `await Future.delay()` but this is not a good way to do stuff.

Start by comparing the Dart-native Hive.init() entry point with the Flutter Hive.initFlutter() entry point and determine whether native initialization can expose completion. Define what callers should observe when initialization finishes, then verify the behavior for both native Dart and Flutter usage.

Written by the indexing model from the issue text.