Fixes T97706 Adds operator to duplicate the active color attribute layer. Adds `"Color Attribute Specials"` menu to color attribute ui to access the `"geometry.color_attribute_duplicate"` operator. Internally adds a function that duplicates a referenced CustomDataLayer - `BKE_id_attribute_duplicate` mostly copies the existing `BKE_id_attribute_new` - but gets the type and domain from the referenced layer - and copies the data from the old layer into the new layer Reviewed By: Joseph Eagar & Hans Goudey & Julien Kaspar Differential Revision: https://developer.blender.org/D14823 Ref D14823
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