feat(select): emit change and select events

Closes #5219

ionic/components/select/test/multiple-value/index.ts

@@ -4,7 +4,13 @@ import {App, Page} from 'ionic/ionic';
 @Page({
   templateUrl: 'main.html'
 })
-class E2EPage {}
+class E2EPage {
+
+  carChange(selectedValues) {
+    console.log('carChange', selectedValues);
+  }
+
+}
 
 
 @App({

ionic/components/select/test/multiple-value/main.html

@@ -22,7 +22,7 @@
 
   <ion-item>
     <ion-label>Car Options</ion-label>
-    <ion-select [(ngModel)]="carOptions" multiple="true">
+    <ion-select [(ngModel)]="carOptions" multiple="true" (change)="carChange($event)">
       <ion-option value="backupcamera">Backup Camera</ion-option>
       <ion-option value="heatedseats">Headted Seats</ion-option>
       <ion-option value="keyless">Keyless Entry</ion-option>