[Improvement] Rate: rename component (#1002)

packages/vant-css/src/index.css

@@ -18,13 +18,13 @@
 @import './search.css';
 @import './pagination.css';
 @import './panel.css';
+@import './rate.css';
 @import './steps.css';
 @import './tag.css';
 @import './tab.css';
 @import './tabbar.css';
 @import './image-preview.css';
 @import './stepper.css';
-@import './star-rate.css';
 @import './progress.css';
 @import './swipe.css';
 @import './slider.css';

packages/vant-css/src/rate.css

@@ -0,0 +1,10 @@
+@import "./common/var.css";
+
+.van-rate {
+  user-select: none;
+
+  &__item {
+    margin: 0 2px;
+    display: inline-block;
+  }
+}

packages/vant-css/src/star-rate.css

@@ -1,8 +0,0 @@
-.van-star {
-  user-select: none;
-}
-
-.van-star-item {
-  margin: 0 2px;
-  display: inline-block;
-}