typst format

[jjallaire]

This PR implements support for the typst output format added in Pandoc v3.1.2.

Getting Started

To try out the typst format, do the following:

1. Install the typist CLI tool: https://github.com/typst/typst#installing

2. Install and configure the development version of Quarto: https://github.com/quarto-dev/quarto-cli#development-version

3. Within the quarto-cli development directory, switch to the feature/typst branch then type quarto check to make sure the branch is correctly configured:

   $ git checkout feature/typst 
   $ quarto check

4. Create a document that uses format: typst. For example:

   ---
   title: "My document"
   format: typst
   ---
   
   Hello, typst!

Typst Options

The following options are available for typst documents:

Option	Description
toc	Include a table of contents.
title	Main document title
author.	One or more document authors.
date	Date of publication
abstract	Article abstract
number-sections	Apply numbering to sections and sub-sections
section-numbering	Schema to use for numbering sections, e.g. 1.1.a.
margin	Margins: x, y, top, bottom, left, right.
papersize	Paper size: a4, us-letter, etc.
fontsize	Font size (e.g., 12pt)
section-numbering	Schema to use for numbering sections, e.g. 1.1.a.
columns	Number of columns for body text.
template	File containing custom typst template
include-in-header	.typ file to include in header
include-before-body	.typ file to include before body
include-after-body	.typ file to include after the body
keep-typ	Keep the intermediate .typ file after render.

Raw Blocks

If you want to use raw typst markup, use a raw typst block. For example:

```{=typst}
#set par(justify: true)

== Background
In the case of glaciers, fluid
dynamics principles can be used
to understand how the movement
and behavior of the ice is
influenced by factors such as
temperature, pressure, and the
presence of other fluids (such as
water).
```

To learn more about typst markup, see the tutorial here: https://typst.app/docs/tutorial/

Known Limitations

• Cross references are supported for figures, sections, and equations (but not subfigures, tables ,or theorems as these aren't yet supported in typst)
• Callouts are not yet supported (they become block quotes with a bold heading)
• Advanced page layout (panel layout, margin layout, etc.) does not work
• There is not yet a system for titles blocks and template partials (as we have for PDF and HTML output)
• Various other small things might not yet be implemented, please let us know if you see things that could use improvement!