Add support for aria-label/labelled-by

[williamernest]

New a11y guidelines indicate that all elements with role="slider" should support a title, label or labelledby attribute as an author provided name is now required.

https://accessibilityinsights.io/info-examples/web/aria-input-field-name/

More details on the newest changes here https://www.w3.org/TR/wai-aria-1.2/#namecalculation