[Feature Request] Add event type to update:search for VAutocomplete

[nbaizaq]

Problem to solve

Ability to distinguish user inputted content from programmatically set search value by input itself when clicked

Proposed solution

Add event type to update:search event, so that end-user can distinguish what type of event is generated, is it Keyboard Input from direct input, paste from clipboard or set by VAutocomplete when clicked on VAutocomplete input.