Added Tex Gyre Pagella

[kcarloni]

I quickly added tex-gyre-pagella to the fonts dictionary, as suggested by this previous PR.

The easiest way I've found to switch between fonts with Makie is by overriding the default FontFamily and then using the texfont function.

using MathTeXEngine: FontFamily, texfont

FontFamily() = FontFamily("TeXGyrePagella")

update_theme!( 
    fonts=(; 
        regular=texfont(:regular),
        bold=texfont(:bold),
    )
)

[Moelf]

is this PR ready? if so, gently bumping @Kolaru

[Kolaru]

Thanks for the gentle bump :)

I need a bit of time to think about how to test that everything is okay (and fix CI apparently).

Also @kcarloni once you have overridden FontFamily, you can also use the theme_latexfonts() to have consistent font in the plot (see https://docs.makie.org/stable/explanations/latex#Uniformizing-the-fonts).

[Kolaru]

CI failure are unrelated, and there isn't much that can be tested easily, so it LGTM

Thanks a lot for the contribution @kcarloni