provide* methods of UiItemsProvider should be replaced by corresponding get* variants.
- [x] Deprecate `provide*` methods of `UiItemsProvider`
- [x] Bump `get*` methods of `UiItemsProvider` to `@public`
- [x] Bump `layouts` properties and types to `@public` i.e. `CommonToolbarItem["layouts"]`, `Widget["layouts"]`
Describe the Solution you'd like
provide*
methods ofUiItemsProvider
should be replaced by correspondingget*
variants.