feature: support pandoc-like languages spec codeblocks

[Martin1887]

Did you check the tree-sitter docs?

• I have read all the tree-sitter docs if it relates to using the parser

Is your feature request related to a problem? Please describe.

Currently, LaTeX blocks are highlighted they are in this form:

```latex
```

However, they are not highlighted when the Pandoc literal syntax is used ({=latex}):

```{=latex}
```

I think that detecting the language when it is enclosed inside ={} would be useful and not difficult to implement.

Thanks!

Describe the solution you'd like

Detecting the language of the codeblock when it is enclosed inside ={}.

Describe alternatives you've considered

No response

Additional context

No response