Vector Graph Exporter to PPTX

Hi, it would be great to export the Touying slides as a vector graph (like SVG and EMF) for PPTX. Besides, metadata in PDF can also be exported to PPTX.

Fortunately, I have the project [`pdf2ppt`](https://github.com/Teddy-van-Jerry/pdf2ppt) available. Is it good to integrate that into the Typst exporter though `pdf2ppt` requires dependencies like `pdf2svg` and Inkscape?