[Feature]: Add a Clear Button to Combobox

[maximepvrt]

Describe the feature

It would be useful to have an option to display a "clear" button in the Combobox component of Reka UI. This button would allow users to remove the selected value(s) and reset the component to its initial state with no selection.

Additional information

• I intend to submit a PR for this feature.
• I have already implemented and/or tested this feature.

[Ericlm]

You can use https://reka-ui.com/docs/components/combobox#cancel I think

[sebsobseb]

You can use https://reka-ui.com/docs/components/combobox#cancel I think

This will simply clear the search term when you are searching, but not the actual underlying model value.

[sebsobseb]

Maybe interesting to mention that the same question for the Select component was asked before: #1237
But, not sure if the same principles apply to the Combobox.

[zernonia]

Have you tried adding ComboboxItem with null value? 😁
https://stackblitz.com/edit/v8mrrgp1?file=src%2FApp.vue