Add LaTeX rendering to Markdown preview

[MostlyKIGuess]

Closes #40813

Continuing from #44525

• add the latex_render crate using ReX to render LaTeX.
• supports inline and display styles, bundles the Latin Modern Math font, and implements a cache.

Working based on #44525 (comment)

There are few issues which need help right now.. I am not exactly sure how we would fix the font tearing and relative sizes, I have tried to keep all the magic numbers on top of all the files to speed up work on this issue.

Release Notes:

• Ability to render LaTeX in markdown preview.

[MostlyKIGuess]

Screenshots from the:

cargo run -p latex_render --example latex_demo

Markdown Preview:

White Theme:

Black Theme:

[pkondzior]

Awesome work!

Having inline() from #48057 would significantly improve the LaTeX renderer. It would let us render inline paragraphs properly, so blocks of text between equations would wrap coherently. Right now, a lot of content overflows especially div lines that exceed their container width and switching to inline rendering should fix that.

[zed-industries-bot]

	Warnings
⚠️	This PR is missing release notes. Please add a "Release Notes" section that describes the change: Release Notes: - Added/Fixed/Improved ... If your change is not user-facing, you can use "N/A" for the entry: Release Notes: - N/A

Generated by 🚫 dangerJS against 76de711

[SomeoneToIgnore]

Will close this as a stale draft with conflicts and no activity for over a month.

[MostlyKIGuess]

Hi @SomeoneToIgnore I can work on fixing the merges, although even for this PR I had used ReX from my fork because of build errors in Zed, I suppose the way Zed works around this is by having it's own forks.

I was hoping that inline would be merged before this so scaling text isn't an issue but if it's not in the roadmap -- I am happy to fix conflicts and get this MVP working.

[Arcitec]

Continued in #54668

Also rewritten by someone in #57339