Parse code-cell outputs into MyST AST

[agoose77]

trafficstars

Proposal

Generated content like Markdown, LaTeX, and tables should be parsed from code-cell outputs into MyST AST. This will enable code-cells to generate content that participates in static export builds (like PDFs).

Definition of done

• Generated Markdown, LaTeX, tables, etc, is represented in the MyST document as sub-AST.