Add gradient color

Hello
wWould it be possible to add a module to be able to put a color system randian? (as in this lib: https://pub.dev/packages/animate_gradient)

Thanks in advance if this feature could be added!

No file, test, or entry point is named. Start by reviewing the package's existing background-color and animation implementation, then compare the requested behavior with animate_gradient; completion would require a defined gradient-color module and a clear way to verify its behavior.

Written by the indexing model from the issue text.