Slider styles

[ay42]

This will enable support for styles to match behaviour of other SwiftUI native elements (Buttons, Pickers, Toggles)

User should be able to specify slider styles.

.valueSliderStyle(...)
.rangeSliderStyle(...)
.pointSliderStyle(...)

This will use makeBody method

func makeBody(configuration: Self.Configuration) -> Self.Body

This will also rename current slider types to

ValueSlider()
RangeSlider()
PointSlider()

with geometry and interactions moving to styles

HorizontalValueSliderStyle() // Default
VerticalValueSliderStyle()
...