refactor(util): 移动并重命名 eventBus.js

1.采用 kebab 风格重命名
2.移动至 core/utils 目录

Author: juzi214032

dist/checkbox-group/index.js

@@ -1,4 +1,4 @@
-import eventBus from '../utils/eventBus';
+import eventBus from '../core/utils/event-bus';
 import rules from '../behaviors/rules';
 
 

dist/core/utils/event-bus.js

@@ -1,4 +1,4 @@
-import eventBus from '../utils/eventBus.js';
+import eventBus from '../core/utils/event-bus.js';
 Component({
   /**
      * 组件的属性列表