[breaking change] CellSwipe: rename to SwipeCell (#1652)

packages/vant-css/src/index.css

@@ -46,7 +46,7 @@
 @import './toast.css';
 
 /* high order components */
-@import './cell-swipe.css';
+@import './swipe-cell.css';
 @import './switch-cell.css';
 @import './tree-select.css';
 

packages/vant-css/src/swipe-cell.css

@@ -1,6 +1,6 @@
 @import './common/var.css';
 
-.van-cell-swipe {
+.van-swipe-cell {
   overflow: hidden;
   position: relative;