Add support for latex output in VSCode Jupyter notebook

[rstanuwijaya]

Background

While jupyterlab and jupyter notebook able to detect the latex output automatically, VSCode Jupyter could not do the same. VSCode Jupyter will only render latex equation if the output mimetype is text/latex, whereas the current version only supports text/html and text/plain as a fallback

I added changes such that it will enable text/latex mimetype output when the evaluation result allows. On my changes, I added toTeX method, which will wrap the result with $$ to allow proper rendering from VSCode.

Comparison

[BinaryQuantumSoul]

This is awesome.
It works perfectly for one line results.
It also works nice for simple results one above each other.

A little caveat I saw though,
If you print the outputs from inside a single function call,
it will give only one output which is composed of two different TeXForm, therefore it's not detected and not formatted. What I wanted to try is to use CellPrint[ExpressionCell[expr//TeXForm]] instead of print. However, CellPrint doesn't work inside vscode jupyter.

Another question is how could we automatically add TeXForm to math equations to not have to write it on each cell.