Add the opt_table_font() method

[rich-iannone]

This adds the opt_table_font() method, which can be used for the easy addition of fonts (or a font stack) to the table. Here's an example where a font stack was used:

from great_tables import GT, exibble

gt_ex = (
    GT(exibble.head(5), rowname_col="row", groupname_col="group")
    .tab_header("THE HEADING", "(a subtitle)")
    .tab_stubhead("THE STUBHEAD")
    .tab_source_note("THE SOURCE NOTE")
    .opt_table_font(stack="industrial")
)

gt_ex

Here's another example where a single font name is prepended to the list of default fonts:

from great_tables import GT, exibble

gt_ex = (
    GT(exibble.head(5), rowname_col="row", groupname_col="group")
    .tab_header("THE HEADING", "(a subtitle)")
    .tab_stubhead("THE STUBHEAD")
    .tab_source_note("THE SOURCE NOTE")
    .opt_table_font(font="Comic Sans MS")
)

gt_ex

Fixes: #175

[machow]

Hey, thanks for opening. What's the status of #262 and #260? I think we should pause this, in order to finish out prior work.

[rich-iannone]

Sounds good. PR #260 is ready for a re-review.

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 86.85%. Comparing base (b6aa4f8) to head (e192a18).

Files	Patch %	Lines
great_tables/_options.py	93.54%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
+ Coverage   86.77%   86.85%   +0.07%     
==========================================
  Files          42       42              
  Lines        4546     4578      +32     
==========================================
+ Hits         3945     3976      +31     
- Misses        601      602       +1     

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