Add basic implementation of the data_color() method

[rich-iannone]

This adds in the data_color() method, and it allows for adding color to data cells based on their values. The data_color() method automatically computes colors based on the column type (allowing you to choose a specific methodology). Here is a basic example of how this method works in practice:

from great_tables import GT
from great_tables.data import gtcars

(
    GT(gtcars[["mfr", "model", "msrp"]], groupname_col="mfr", rowname_col="model")
    .data_color(columns="msrp", palette=["white", "lightgreen"])
    .fmt_currency(columns="msrp", use_subunits=False)
)

[machow]

Ah, I think we need to pin griffe==0.38.1 in our dev dependencies of pyproject.toml for now. A release from yesterday changed how it represents unrecognized sections. (It should be a quick fix to update quartodoc, and once that's released we can unpin it! Also I made the PR to change the behavior in griffe so this is on me 😅)

[rich-iannone]

Excellent investigative work! I’ll do what you said, thanks!