Add {toggle} directive handling for latex and latexpdf

[mmcky]

Describe the solution you'd like

We need to add pdf handling for toggle directive for parity with html writer.

It will need to be decided how to represent the toggle directive in pdf format. An alternative would be not to support it as an incompatible document feature for static pdf files

[mmcky]

https://beta.jupyterbook.org/use/hiding.html?highlight=toggle#hide-markdown-using-myst-markdown

[choldgraf]

We could always just have this show up as a "container" would in PDF outputs...

[AakashGfude]

So, we will just need visit, depart methods in latex translator for the toggle to behave like a container