allow to start tying on dropdownbox for search

[dhruvinsh]

First of all, bravo to the project. It is fabulous project. 👏

Is your feature request related to a problem? Please describe.
NA

Describe the solution you'd like
For any drop down box, allow to start typing right away rather then pressing down key and searching. May external package:
https://github.com/darrenburns/textual-autocomplete

[whyisdifficult]

Hey @dhruvinsh , thanks for the compliments and thanks for the pointer on that. I have been thinking about how to do this and this library will help me implement the feature.