- created `ClearableInpu`t component on web & native
- added `ClearableInput` component to participants pane and used it for search in participants list
- update `AddPeopleDialog` to use `ClearableInput`

It crashes on Android. Well, on the JSC version React Native uses on Android.

While we could use this fallback only on Android, we have decided to use it
on all mobile platforms for consistency.