feat: support nested container syntax in list in mdx-rs

[JounQin]

Summary

Related Issue

close #1513

related web-infra-dev/mdx-rs#69

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for aquamarine-blini-95325f ready!

Name	Link
🔨 Latest commit	d6abdc0
🔍 Latest deploy log	https://app.netlify.com/sites/aquamarine-blini-95325f/deploys/6784d08f7a972600081f7668
😎 Deploy Preview	https://deploy-preview-1745--aquamarine-blini-95325f.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 84 (🟢 up 2 from production) Accessibility: 97 (no change from production) Best Practices: 92 (no change from production) SEO: 100 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[Timeless0911]

Seems that it not work on components in mdx-rs but mdx-js do. Maybe the implementation of mdx-rs is not strictly align with mdx-js already before.

## In Steps

import { Steps } from '@theme';

<Steps>
### Title1

:::tip
This is a tip.
:::

### Title2
</Steps>

[JounQin]

in mdx-rs, the ast is hast, but in mdx-js, it's mdast, not sure how Steps is presented in hast.

See also #1527 (comment)

[Timeless0911]

I think we should think more about the future of mdxrs in Rspress 2.0. @SoonIter