Expose ability to toggle the select2 between disabled and enabled

[anddrzejb]

Is your feature request related to a problem? Please describe.
I would like to have a common select box that will either be active or inactive depending on the information that is arriving from endpoints.

Describe the solution you'd like
The best case scenario I imagine would be to just change current InputSelect2Options.Diabled for changes to reflect on the control.

Describe alternatives you've considered
I image I could just replace the control with a disabled input. I do not like this solution as it changes the way the page looks like. I think it is a good idea to keep the visuals consistent.

[anddrzejb]

Thanks for this component. It served me quite well. Unfortunately lack of any communication led me to move to AntDesign. Good luck!