refactor: migrate project to Flutter best practice

[TheOneWithTheBraid]

• BREAKING: remove async gaps from BuildContext
  • See README for migration
• BREAKING: remove built-in provider storage
  • See README for migration
• Fix missing await statement for asynchronous tasks

[p1gp1g]

That's OK to remove the dialog from the unifiedpush package, if we provide a unifiedpush_ui package that does it. I think this package should not depend on unifiedpush to reduce maintenance load.

If we go that way, then:

1. We should publish unifiedpush_ui
2. We should deprecate registerAppWithDialog
3. Publish a new version
4. Remove registerAppWithDialog in the next major version, which should happen in a few months

What do you think about this ? If you like the idea, do you want to help for the new lib ?

[p1gp1g]

Gentle ping for the question @TheOneWithTheBraid

[TheOneWithTheBraid]

I'm privately a bit busy these days. You can expect the adjustments within the next two weeks.

[p1gp1g]

Thanks for the answer, I'll also see if I've time to do it

[p1gp1g]

What do you think about this solution ? https://codeberg.org/UnifiedPush/flutter-connector/pulls/1