Add colorscheme spec as vector of color strings

[juliohm]

This specification is already supported by Makie.jl and other plotting ecosystems.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a33da71) to head (6a15537).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

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[Copilot]

Pull request overview

This PR adds support for specifying color schemes as vectors of color strings, aligning with conventions used in Makie.jl and other plotting ecosystems. The implementation allows users to pass a vector like ["black", "white"] as a colorscheme parameter, which is automatically converted to a ColorScheme object.

Key Changes

• Extended ascolorscheme function to accept AbstractVector of color strings
• Updated documentation to use more generic "color scheme specification" terminology
• Added tests verifying the new vector-based colorscheme functionality

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/Colorfy.jl	Added new method for ascolorscheme to parse vector of color strings into ColorScheme objects; updated documentation to reflect broader colorscheme input options
test/runtests.jl	Added tests validating that vector colorscheme specifications work correctly with two-color gradient

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[juliohm]

Sorry for pinging you @eliascarv. I believe the changes are simple enough and I don't want to bother you during the holiday break.