Document how to view Entities package builds (ContentArchives) with UnityDataTool

UnityDataTool can read the content of StreamingAssets/ContentArchives for Entities builds.

This is a less common type of content build that uses content files instead of AssetBundles so some notes to help understand that type of data would be very helpful (but lower priority than covering the most common build pipelines)

The functionality in question has some document here:
https://docs.unity3d.com/Packages/com.unity.entities@6.5/manual/content-management-intro.html

从 UnityDataTool 对 StreamingAssets/ContentArchives 的行为入手，并阅读链接的 Unity Entities 内容管理文档。添加说明，解释如何查看 Entities package 的构建结果、它们的内容文件与 AssetBundles 有何不同，以及用户在检查这些文件时应当预期什么。