`RangeControl`, `SpacingSizesControl`: Consolidate mark styling

[jameskoster]

RangeControl allows consumers to display marks along the slider:

SpacingSizesControl has as similar function, but the styling is completely different:

Ideally the appearance of these components is consolidated to reduce visual inconsistencies.

[richtabor]

I lean towards the SpacingSizesControl implementation. Works better in smaller contexts too.

[jasmussen]

Agreed, the SpacingSizesControl works well.