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demo-extension-button-provider
导出类型扩展接口demo
demo生效后，设计器上的本身的导出按钮编辑时会新增Hell A和Hello B两个类型可选择。
在预览模板导出时，导出下拉菜单选项会增加Hello选项和 Hello A、Hello B两个子选项
点击会有alert弹窗
