feat(mdx): support recma plugins

[slorber]

Motivation

Fix #10237

MDX supports Recma plugins, and it's useful for some use cases of our community, so let's expose that option.

https://mdxjs.com/packages/mdx/#:~:text=recmaPlugins,-(PluggableList%20from

Test Plan

options unit tests + dogfood test to ensure it's wired properly

Test links

https://deploy-preview-10241--docusaurus-2.netlify.app/tests/docs/doc-without-sidebar/

Using this plugin works: https://github.com/domdomegg/recma-mdx-displayname

[netlify]

✅ [V2]

Name	Link
🔨 Latest commit	638fbc8
🔍 Latest deploy log	https://app.netlify.com/sites/docusaurus-2/deploys/6675b210bddcdd000872e07e
😎 Deploy Preview	https://deploy-preview-10241--docusaurus-2.netlify.app
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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟢 92	🟢 98	🟢 96	🟢 100	🟠 88	Report
/docs/installation	🟠 60	🟢 96	🟢 100	🟢 100	🟠 88	Report
/docs/category/getting-started	🟠 75	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog	🟠 71	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 65	🟢 96	🟢 100	🟢 100	🟠 88	Report
/blog/tags/release	🟠 71	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog/tags	🟠 75	🟢 100	🟢 100	🟢 90	🟠 88	Report

[github-actions]

Size Change: +123 B (+0.01%)

Total Size: 1.85 MB

Filename	Size	Change
website/.docusaurus/docusaurus.config.mjs	27.2 kB	+96 B (+0.35%)

ℹ️ View Unchanged

Filename	Size	Change
website/.docusaurus/codeTranslations.json	2 B	0 B
website/.docusaurus/globalData.json	123 kB	0 B
website/.docusaurus/i18n.json	930 B	0 B
website/.docusaurus/registry.js	304 kB	0 B
website/.docusaurus/routes.js	202 kB	0 B
website/.docusaurus/routesChunkNames.json	130 kB	0 B
website/.docusaurus/site-metadata.json	2.17 kB	0 B
website/build/assets/css/styles.********.css	112 kB	0 B
website/build/assets/js/main.********.js	906 kB	+27 B (0%)
website/build/index.html	38.1 kB	0 B

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