Add tate-color palette

[strengejacke]

[strengejacke]

Default palette

Mix palette

Light palette

All colors

[strengejacke]

@easystats/maintainers not sure if it's worth adding to the package?

[etiennebacher]

On light background, I find them very hard to distinguish (especially the default one)

[bwiernik]

They would look nice on an off-white or beige background

[rempsyc]

Why not. But I agree with Etienne the default palette is a bit hard on the eyes I feel