Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and discussions and couldn’t find anything (or linked relevant results below)

Problem

Now we have @mdx-js/rollup, which is compatible with vite, even rolldown vite.

However, @mdx-js/rollup depends on @rollup/pluginutils (for filter), which depends on rollup itself, so rollup is introduced where it's not necessary.

Current solutions

Use @mdx-js/rollup for now.

Proposed solutions

I want a new @mdx-js/rolldown package, which leverages @rolldown/pluginutils, so rollup will not be introduced where it's not needed.