feat: allow rendering of tables to LaTeX

[rich-iannone]

This feature PR implements the rendering of tables to LaTeX, addressing #75 and #178. This will be exposed through the as_latex() method on the GT class. If in Quarto and the render target is LaTeX, tables will be automatically rendered as LaTeX tables.

Preview: https://pr-481--gt-python.netlify.app/a-latex_examples/index.pdf.

[codecov]

Codecov Report

Attention: Patch coverage is 95.26917% with 29 lines in your changes missing coverage. Please review.

Project coverage is 88.88%. Comparing base (cc9829c) to head (c2f7c81).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
great_tables/_formats.py	92.25%	22 Missing ⚠️
great_tables/_utils.py	88.46%	3 Missing ⚠️
great_tables/_utils_render_latex.py	99.13%	2 Missing ⚠️
great_tables/_gt_data.py	80.00%	1 Missing ⚠️
great_tables/_spanners.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #481      +/-   ##
==========================================
+ Coverage   87.86%   88.88%   +1.01%     
==========================================
  Files          42       44       +2     
  Lines        4852     5216     +364     
==========================================
+ Hits         4263     4636     +373     
+ Misses        589      580       -9     

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[machow]

From pairing -- we ran the examples from https://posit-dev.github.io/great-tables/examples/ .

Main pieces:

• Explicitly raise or warn for currently unsupported behaviors (e.g. styles)
• formatters sometimes run but their output generate latex errors
  • fmt_nanoplot
  • fmt_markdown
  • fmt_image
  • fmt_url
  • fmt_integer (?) -- this seems to raise a python error
• the md() and html() functions produce output that causes latex errors (but maybe this is okay?)

One interesting note is that quarto can handle images and urls in tables. We don't have to do the same, but it's worth documenting down quarto's behavior the road!

[rich-iannone]

• Explicitly raise or warn for currently unsupported behaviors (e.g. styles)

Now we warn when there is any definition of tab_style() in LaTeX output.

• formatters sometimes run but their output generate latex errors
  • fmt_nanoplot
  • fmt_markdown
  • fmt_image
  • fmt_url
  • fmt_integer (?) -- this seems to raise a python error

• fmt_integer() is fine. No error on second look
• fmt_url() is not in API.
• fmt_image now provides a warning and formatting is skipped
• fmt_markdown raises a NotImplementedError in LaTeX render
• fmt_nanoplot also raises a NotImplementedError

• the md() and html() functions produce output that causes latex errors (but maybe this is okay?)

• md() still raises a NotImplementedError
• html() will warn and perform LaTeX escaping on the string

[machow]

From pairing, LGTM -- thanks for this ENORMOUS push, excited for latex tables!