Support Tikz in Slidev

[issaccv]

Is your feature request related to a problem? Please describe.

I am a researcher. Thanks to slidev's complete community ecology, I can use markdown to quickly complete some simple reports and introduce rich animation effects. I can almost entirely use slidev instead of Latex for reporting. However, whenever I need to display complex drawings, especially tikz charts that are very common in latex, I have to put the screenshots into the public folder. This way the screenshots produce different resolutions on different screens. As a result, it is difficult to obtain the best display effect.

Describe the solution you'd like
Based on my investigation, I found a plugin from the hexo community: https://github.com/prinsss/hexo-filter-tikzjax

This plug-in enables markdown to support tikz syntax. Specifically, you can draw a tikz chart in the following way

```tikz
\begin{document}
\begin{tikzpicture}[domain=0:4,scale=1.1]
\draw[very thin,color=gray] (-0.1,-1.1) grid (3.9,3.9);
\draw[->] (-0.2,0) -- (4.2,0) node[right] {$x$};
\draw[->] (0,-1.2) -- (0,4.2) node[above] {$f(x)$};
\draw[color=red] plot (\x,\x) node[right] {$f(x) =x$};
\draw[color=blue] plot (\x,{sin(\x r)}) node[right] {$f(x) = \sin x$};
\draw[color=orange] plot (\x,{0.05*exp(\x)}) node[right] {$f(x) = \frac{1}{20} \mathrm e^x$};
\end{tikzpicture}
\end{document}
```

Describe alternatives you've considered
I'm not familiar with JavaScript, but it would be great if slidev could support tikzjax the same way it supports katex!