feat(dev/vite): add MDX route support to RSC Framework Mode

[markdalgleish]

Note that this feature depends on this PR to @mdx-js/rollup being published: mdx-js/mdx#2629. For now, this fix is provided as a patch in this PR.

[changeset-bot]

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[github-actions]

🤖 Hello there,

We just published version 7.8.1-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 7.8.1 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!