AtFloatLayout 希望可以添加 closeOnClickOverlay 属性

**这个功能解决了什么问题？**
AtFloatLayout 组件被勿触到遮罩层的时候将 其关闭了。

**你期望的功能是怎样的？**
添加一个 `closeOnClickOverlay` 属性，可以让开发者在适当的应用场景中自己来处理点击遮罩层是否关闭 `AtFloatLayout` 组件。

**补充信息**

Locate the AtFloatLayout component and inspect how its overlay click currently closes the component. Define the requested closeOnClickOverlay behavior and verify that the component can preserve or close itself according to that option, using any existing component checks or examples found alongside AtFloatLayout.

Written by the indexing model from the issue text.