text: Title: Enhancement: Slider component can display it's current value
  Body: A nice update to the `Slider` component would be to have it be able to display it's current value. It could be toggled on/off with a prop like `display_value`, which maybe defaults to `false` so it doesn't change behaviour. If `true`, it could display the `value` in a `<div/>` or `<label/>` below it (or above it?) and perhaps it could be styled with props like `value_style` and `value_className`. Perhaps a better name would be `label`, so `display_label`, `label_style`, and `label_className`.