Do not autoclose $ after an escaping slash

[Trebor-Huang]

Currently the autoclosing pairs in the VSCode language configuration lists $ and $. This is slightly annoying when dealing with money. Is this possible with the language configuration alone? A quick glance at the documentation suggests that it is unlikely. We might perhaps achieve this by hacking the notIn option, putting the character behind a backslash in a comment region.

Another way might be to declare "\$" and "" as an autoclosing pair. I haven't tested whether it works, but it does behave correctly when dealing with \( and ( simultaneously in TeX language configurations, so maybe it's worth a try.

[Myriad-Dreamin]

It is not easy to get fixed in language configuration.

To fix it, we can remove the auto-closing $ pair from language configuration and handle it by some customized handler, like https://github.com/CFiggers/typst-companion/blob/main/src/listEditing.ts.