[new]调整监听

lib/src/listener/banner_ad_listener.dart

@@ -1,6 +1,6 @@
 import 'atmob_ad_listener.dart';
 
-abstract class BannerAdListener implements AtmobAdListener {
+class BannerAdListener implements AtmobAdListener {
   final void Function() onAdClick;
   final void Function() onAdClose;
   final void Function(String msg) onAdFail;

lib/src/listener/interstitial_full_ad_listener.dart

@@ -1,6 +1,6 @@
 import 'package:flutter_ad/src/listener/atmob_ad_listener.dart';
 
-abstract class InterstitialFullAdListener implements AtmobAdListener {
+class InterstitialFullAdListener implements AtmobAdListener {
   final void Function() onAdClick;
   final void Function() onAdClose;
   final void Function(String msg) onAdFail;

lib/src/listener/native_ad_listener.dart

@@ -1,6 +1,6 @@
 import 'package:flutter_ad/src/listener/atmob_ad_listener.dart';
 
-abstract class NativeAdListener implements AtmobAdListener {
+class NativeAdListener implements AtmobAdListener {
   final void Function() onAdClick;
   final void Function() onAdClose;
   final void Function(String msg) onAdFail;

lib/src/listener/reward_video_ad_listener.dart

@@ -1,6 +1,6 @@
 import 'package:flutter_ad/src/listener/atmob_ad_listener.dart';
 
-abstract class RewardVideoAdListener implements AtmobAdListener {
+class RewardVideoAdListener implements AtmobAdListener {
   final void Function() onAdClick;
   final void Function() onAdClose;
   final void Function(String msg) onAdFail;