Label code blocks with filename

[Dedekind561]

Which module(s) and week(s) does this change affect? Module(s): all Week(s): all

What is the work that needs to be done?

Will be super useful to annotate a shortcode block with a filename similar to the way this was possible with Docusaurus:

Why is this work important to do?

Often need to refer to specific files in a directory structure or give a meaningful file name to a code snippet.

Additional context

Who might need to know about this change?

[nadhamsaipallavi]

hello, I would like to contribute to this issue