List Item: Add border support (#63541)

Co-authored-by: aaronrobertshaw <[email protected]>
Co-authored-by: andrewserong <[email protected]>

packages/block-library/src/list-item/block.json

@@ -23,6 +23,12 @@
 		"anchor": true,
 		"className": false,
 		"splitting": true,
+		"__experimentalBorder": {
+			"color": true,
+			"radius": true,
+			"style": true,
+			"width": true
+		},
 		"color": {
 			"gradients": true,
 			"link": true,
@@ -57,6 +63,7 @@
 		}
 	},
 	"selectors": {
-		"root": ".wp-block-list > li"
+		"root": ".wp-block-list > li",
+		"border": ".wp-block-list:not(.wp-block-list .wp-block-list) > li"
 	}
 }