Add data binding for current search term

Is your feature request related to a problem? Please describe. It would make life easier to build custom behavior related to searching if the component supported data binding for the current search term.

Describe the solution you’d like A new API field [searchTerm] or similar that reflects the current state of the search field.

Describe alternatives you’ve considered Right now I have to keep track of current search term with callbacks. Currently to do this requires coordination across multiple callbacks of (search), (clear), and (close) because all of these modify the current search term. Providing the data binding is much simpler.

[varnastadeus]

this is how you can access it in HTML. In typescript, you would need to use @ViewChild

search term: {{select.searchTerm}}

<ng-select 
           #select
           [items]="defaultBindingsList"
           [(ngModel)]="selectedCity">
</ng-select>

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