Adjustable as a container property

[akaDuality]

We should have different behaviour for VoiceOver and Voice Control for adjustable elements.

For Voice Control we should split button to communicate with app like "Press M" (or press Middle, when we have accessibilityInputLabels) to select middle size.

For VoiceOver we should wrap in adjustable elements: focus on single element, but change value by vertical swipe.

We can join both behaviours by adding "adjustable" type for containers. The property can provide elements' labels like a values of adjustable control.

Switch Control also should have container for buttons. As a result SW focus on whole element and switch between elements after that.