Implement `ApplicationDataContainer` APIs

[xperiandri]

What would you like to be added:

ApplicationDataContainer related APIs: Windows.Storage.ApplicationData.Current.LocalSettings.Containers

Why is this needed:

To store settings in buckets

For which Platform:

• [X] iOS
• [X] Android
• [X] WebAssembly
• [ ] WebAssembly renderers for Xamarin.Forms
• [X] macOS
• [ ] Skia
  • [ ] WPF
  • [ ] GTK (Linux)
  • [ ] Tizen
• [ ] Windows
• [ ] Build tasks
• [ ] Solution Templates

[xperiandri]

@MartinZikmund is it something you can have a look after pickers?

[Juansero29]

Also interested in the implementation of ApplicationDataContainer methods in Windows.Storage for Uno as well as the ApplicationDataCreateDisposition enum

[christianfo]

Is there a recommendation as to what to use to implement application settings/preferences until this is implemented? Maybe Xamarin.Essentials Preferences?

[MartinZikmund]

While LocalSettings.Containers is not implemented, you can still use LocalSettings themselves without trouble on all targets - see docs

[christianfo]

Oh, got it, thank you!