feat(combox) allow add value to list, if not exist

[DamirSadykov]

Is your feature request related to a problem? Please describe.
I am creating a form component that lets users select options dynamically. If a user enters a value that is not already in the combobox list, it should be added. I checked the API Reference but couldn't find a way to do this.

Describe the solution you'd like
Expected behavior:
When the enter key is pressed, if the value is not in the list, it should be added and processed as if it was already there.

Describe alternatives you've considered
I was looking at onInputChange, from which I take the value after pressing enter and directly add it to the list for the combobox.

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I can try create PR for it issue