[Slider] Add ability to pass a ref prop for input element through SliderThumb

[metalix2]

Description

Hello 👋

Thank you for reading my PR. 🙏

I've found a use case where we're not able to interact with the input element in the Slider thumb. While you try to take care of this with the BubbleInput it's still limiting for consumers who want to do more e.g. pass more attributes or just have context of the input element itself.

With this change, it enables consumers to set an accessable ref on the input element. Allowing the consumer to set attributes like form or id (for related label elements).
Consumers can also add their own onEventListeners directly to the <input>.

Changes

• Added inputRef Prop for SliderThumb and BubbleInput
• Updated Slider Storybook with inputRef example.

If there is anything you are unsure about please do comment quesitons, suggestions the lot.

Best Wishes