[4.5/n] Native Typeahead - Refactoring to the common utility function

Summary: Refactoring some web code into lib function that will be used in native side as well.

Test Plan:
Checked if app builds.
Checked if web typeahead still works corretly

Reviewers: inka, ginsu, kamil, michal, tomek

Reviewed By: tomek

Subscribers: ashoat, tomek, atul, michal, kamil, ginsu, inka

Differential Revision: https://phab.comm.dev/D6415