✨ Add support for specifying lines and line ranges

[tiangolo]

✨ Add support for specifying lines and line ranges.

For example:

{!filename!lines=1  3 8-10  2}

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Thanks for this extension! It has been very useful, I use it to include all the examples for the docs for FastAPI and Typer. 🎉

That way I can test the same source files used in the documentation. ✔️

Now I want to use this extra feature I'm proposing to include specific lines or line ranges, in particular for a new project I'm building, to be able to focus the reader's attention on a particular segment of a file. While still having a complete valid file shown at the end, that can be copied and run, because it's also part of the tests.

I'm using almost the same syntax used to highlight lines with Material for MkDocs hl_lines hl_lines="1 3 8-10 2".