js: list add reload api

doric-js/lib/src/widget/list.d.ts

@@ -54,6 +54,7 @@ export declare class List extends Superview {
      */
     findCompletelyVisibleItems(context: BridgeContext): Promise<number[]>;
     reset(): void;
+    reload(context: BridgeContext): Promise<void>;
     private getItem;
     private renderBunchedItems;
     toModel(): NativeViewModel;

doric-js/lib/src/widget/list.js

@@ -71,6 +71,9 @@ export class List extends Superview {
         this.cachedViews.clear();
         this.itemCount = 0;
     }
+    reload(context) {
+        return this.nativeChannel(context, 'reload')();
+    }
     getItem(itemIdx) {
         let view = this.renderItem(itemIdx);
         view.superview = this;