{python} support

[MichaelHatherly]

Adds support for evaluating {python} code by running it via PythonCall.jl.

Users must import PythonCall into their notebook for this feature to work. Supports Julia expression interpolation in a similar way to the {r} support that is backed by RCall.

With this we can run notebooks that contain Julia, R, and Python and send values between all three, below we use the iris dataset from R, and pass it to seaborn for plotting. There'll be room to improve the conversion of values between languages, but that can be improved at a later time.

Fixes #108. Replaces #185.

[codecov]

Codecov Report

Attention: Patch coverage is 9.35252% with 126 lines in your changes missing coverage. Please review.

Project coverage is 30.18%. Comparing base (a9fb2e9) to head (2542d54).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ookWorker/ext/QuartoNotebookWorkerPythonCallExt.jl	0.00%	120 Missing ⚠️
src/QuartoNotebookWorker/src/render.jl	0.00%	4 Missing ⚠️
src/QuartoNotebookWorker/src/python.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #255      +/-   ##
==========================================
- Coverage   31.42%   30.18%   -1.24%     
==========================================
  Files          55       57       +2     
  Lines        2457     2591     +134     
==========================================
+ Hits          772      782      +10     
- Misses       1685     1809     +124     

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[MichaelHatherly]

I've yet to work out the "correct" way to output multiple plots from a cell, so that Quarto can then do layout (https://quarto.org/docs/authoring/article-layout.html). But what does actually just work is interpolating the display function from Julia... So you can already do

```{python}
p1 = plot(...)
$(display)(p1)

p2 = plot(...)
$(display)(p2)
```

and that'll hook into Julia's display system and correctly render plots, or tables (or whatever else).

[MichaelHatherly]

@felixcremer @tuncbkose fyi, this is the latest work towards supporting Python cells in this backend. You were both previously interested in this, so feel free to take this branch for a spin if you get the chance.

[MichaelHatherly]

Adjustments to the approach used to parse and compile the source prior to evaluation now means stacktraces from Python errors all point to the correct locations within the notebook. Additionally, support for a help mode, via prefixed ? like in Julia cells, has been added as well.