MDX and edge function size limit

I'm using contentlayer with MDX for a blog and it is working pretty well, but recently i would like to use it in a vercel edge function as well. Edge functions have a bundle size limit of 1mb, which is achieved quite quickly with contentlayer and MDX. I've written about the problem and my workaround [here](https://sdorra.dev/posts/2022-11-24-contentlayer-mdx-edge). It would be nice if some better solution would be backed into contentlayer.

A few possible solutions come to my mind.

1. Split the body from the rest of the content and load it on demand with an async function on the entity
2. Option to create a separate collection of the entity without body
3. Hooks which makes it easy to write a separate collection without body on every change

从链接的 workaround 开始，检查 Contentlayer 当前如何为 edge-function bundle 生成 MDX 内容。比较提出的三种方案，然后定义并实现一个达成共识的解决方案，在保留对内容正文访问的同时，将 bundle 控制在 1 MB 限制以内。

由索引模型根据 Issue 内容生成。