Debugging option to list mods with an access widener for items

[bluebear94]

This would make it easier to find which mod is widening access to a certain item without checking each mod (and its dependencies) individually.

Recently, I had an issue where Create’s train station screen would crash the game when Caxton is installed, but only on a production Fabric environment. I traced this down to a method (TextRenderer#getFontStorage) having an access widener in the dev env but not in the production env, but I couldn’t identify the specific mod having an AW for that method.