feat(segment): wrapping in addition to stackable

This PR adds an alias wrapping to the current stackable horizontal segments for consistency as we already use wrapping for button groups or menu items which actually wrap single elements instead of stacking all of them at once which is meant by "stackable" in every other element.

The horizontal stackable variant gets deprecated and will be removed in 2.10

src/definitions/elements/segment.less

@@ -437,6 +437,7 @@
             border-radius: @groupedBorderRadius;
             border: @groupedBorder;
         }
+        .ui.wrapping.horizontal.segments,
         .ui.stackable.horizontal.segments {
             flex-wrap: wrap;
         }
@@ -473,7 +474,7 @@
         .ui.segments > .horizontal.segments:first-child {
             border-top: none;
         }
-        .ui.horizontal.segments:not(.stackable) > .segment:first-child {
+        .ui.horizontal.segments:not(.stackable):not(.wrapping) > .segment:first-child {
             border-left: none;
         }
         .ui.horizontal.segments > .segment:first-child {