Slider: Add touch event support for better mobile interaction

[nikunj8866]

Reference: https://core.trac.wordpress.org/ticket/63208

Description

The slider currently lacks touch interaction support on mobile devices, making it difficult for users to navigate between steps using touch gestures. This limitation affects the feature's usability and accessibility on touchscreen devices.

Screencast

https://screenrec.com/share/W1clQoqGSR

[mgol]

Thanks for the report. We're avoiding adding new features to components at this stage of jQuery UI, but this one seems important and the patch is not that big, so I'll look into it.