uui-combobox misses disabled and readonly states

[iOvergaard]

Which exact UI Library version are you using? For example: 1.0.1 - don't just write v1.

1.1.0

Bug summary

The combobox resembles a native select element and should implement disabled and readonly states.

Specifics

No response

Steps to reproduce

1. Add a <uui-combobox disabled> or <uui-combobox readonly> and see that nothing happens

Expected result / actual result

Disabled state = everything is greyed out and the value is not submitted

Readonly state = everything is greyed out, but the value is still submitted

(see uui-input for example)