Add support for ESM

We are using basic scroll in our angular projects and it works great.

As angular has recently switched to an ESM based build using Vite, we get some warnings when starting our application:

It would be great, if you could provide an export of your plugin as ESM version?

该 issue 未指明任何文件或测试。首先检查 package 现有的 JavaScript 构建和导出配置，然后验证 ESM import 能够在 Angular/Vite 项目中正常工作，且不会出现报告中的警告。有可用的 ESM 发行版本即表示完成。

由索引模型根据 Issue 内容生成。