message: [new feature] Sku: sku-group slot add event bus
  [new feature] Sku: sku-group slot add event bus
diff: </van-sku-header>
  </slot>
  <div class="van-sku-body scroller" :style="bodyStyle">
  - <slot name="sku-group" :selectedSku="selectedSku">
  + <slot name="sku-group" :selectedSku="selectedSku" :skuEventBus="skuEventBus">
  <div v-if="hasSku" class="van-sku-group-container van-hairline--bottom">
  <div v-for="(skuTreeItem, index) in skuTree"
  class="van-sku-row-group"
  