[docs-infra] Migrate to @mui/internal-docs-infra Demos

[dav-is]

Note

This PR is a work in progress. All demos have been migrated, but not all features have been completed

Improvements:

• Adds collpase / expand animation (experimental, still needs tweaks from a design review)
• Maintains code state when expanding and collapsing
• Code reset button can be undone with Ctrl+Z
• Multi-file demos have their "Open in Github" link go to the selected file instead of the first file
• holding backspace doesn't waste CPU re-rendering the demo
• browser-native cursor changes color since we use content-editable instead of <textarea> overlay
• using inspect element on highlighted code works instead of selecting the <textarea> overlay

Improvements not yet completed:

• TS/JS button won't appear if the .ts file has no inline types (the file is exactly the same)
• fix keyboard navigation on code toolbar
• support for // @highlight

Preview

Migrate to @mui/internal-docs-infra:

• CodeHighlighter
• useDemo() - client hook
• abstractCreateDemo({ DemoContent }) - factory function helper
• loadPrecomputedCodeHighlighter - webpack loader

Upstream TODO List

TODO in this PR:

• Fix theme reset for demos
• Tweak expand/collapse animation
• Add dropdown to open in github, copy link, etc
• Fix "Edit in Chat"
• Fix fully-hidden code style of demo

[mui-bot]

Netlify deploy preview

• docs/data/material/components/buttons/buttons.md

Bundle size report

Bundle	Parsed size	Gzip size
@mui/material	0B(0.00%)	0B(0.00%)
@mui/lab	0B(0.00%)	0B(0.00%)
@mui/system	0B(0.00%)	0B(0.00%)
@mui/utils	0B(0.00%)	0B(0.00%)

Details of bundle changes

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