Add Classy ckeditor5-stylesheets config

As first step in order to test it as @bnjmnm propose is to create a simple patch to change into ckeditor5_stylesheets and then get ready for manual tests

I have modified the patch to add an additional key "ckeditor5-stylesheets" instead of replacing the "ckeditor_stylesheets" key to make the theme compatible ith both drupal/ckeditor (CKEditor 4) and drupal/ckeditor5

make a change to the patch to make it patch more reliable

No longer postponed as the blocking issue is now fixed.

Thanks @jrglasgow for the patch in #10. It applies applies smoothly.

#10 works for me with Classy 1.0.2 in D10.2.0. Setting to RTBC.

+1 RTBC

Doubt this will ever get fixed as classy is deprecated. But the patch works for us as well as we work into removing classy as our base theme.

I have added this patch in Drupal 9.5.11.

@BramDriesen Core Classy is deprecated, but this is the contrib Classy module, which isn't deprecated. It's just contrib.

@shalini_jha That is for Core, not for this module.

RE #17: Correct, but as it's not recommended for new projects, it does feel deprecated ;)

We do not recommend new projects use this theme, but this existing projects that depend on Classy may use this for Drupal 10+ and it should work no differently than if it were using the Drupal core Classy.