gpui_macros: Extract `border_style_methods` macro (#14514)
This PR extracts a separate `border_style_methods` macro so that it can
be used independently from `style_helpers!`.
Release Notes:
- N/A
143035b1edMarshall Bowers committed on 7/15/2024, 7:51:29 PM· committed by GitHubparentfa3d290