ColumnFilter | Add onShow & onHide events

[cetincakiroglu]

Two new event emitters will be introduced:

    /**
     * Callback to invoke on overlay is shown.
     * @param {Event} originalEvent - Animation event.
     * @group Emits
     */
    @Output() onShow: EventEmitter<{ originalEvent: AnimationEvent }> = new EventEmitter<{ originalEvent: AnimationEvent }>();
    /**
     * Callback to invoke on overlay is hidden.
     * @param {AnimationEvent} originalEvent - Animation event.
     * @group Emits
     */
    @Output() onHide: EventEmitter<{ originalEvent: AnimationEvent }> = new EventEmitter<{ originalEvent: AnimationEvent }>();