Source ranges

[jkrumbiegel]

This PR is the QNR side of fixing #310, the corresponding PR in quarto-cli is quarto-dev/quarto-cli#13401. This PR will have to be merged and tagged first before the quarto PR can pass final CI and be merged as well. The change is backwards compatible in that if no source ranges are supplied, the original file's line numbers are used like before.

The effect of this is that evaluated Julia cells get the correct file paths and line numbers so that code in includes can be correctly traced back. For example something like this (plus includes that also print file and line)

---
keep-md: true
engine: julia
---

{{< include "subfolder/_include.qmd" >}}

This is some text in scratch.qmd

```{julia}
"$(@__FILE__):$(@__LINE__)"
```

gives something like this

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.10%. Comparing base (fa10ed9) to head (5d622ba).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #339      +/-   ##
==========================================
+ Coverage   79.43%   80.10%   +0.67%     
==========================================
  Files          39       39              
  Lines        2071     2106      +35     
==========================================
+ Hits         1645     1687      +42     
+ Misses        426      419       -7     

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[MichaelHatherly]

Only one changed requested to avoid accessing a field and rather using first() instead.

[jkrumbiegel]

I wasn't sure at first if there could be empty ranges (for which first would error) but I think that can't happen even in the weird cases that quarto inserts