add create webview event and fix fire event in model view (#2405)

src/sql/parts/modelComponents/inputbox.component.ts

@@ -121,7 +121,7 @@ export default class InputBoxComponent extends ComponentBase implements ICompone
 					if (input.hideErrors) {
 						input.hideErrors = false;
 					}
-					this._onEventEmitter.fire({
+					this.fireEvent({
 						eventType: ComponentEventType.onDidChange,
 						args: e
 					});