feat: add preloadItemCount for List, incase we need preload more items before scroll to end

doric-android/doric/src/main/java/pub/doric/shader/list/ListAdapter.java

@@ -68,7 +68,7 @@ class ListAdapter extends RecyclerView.Adapter<ListAdapter.DoricViewHolder> {
                 holder.listItemNode.blend(jsObject.getProperty("props").asObject());
             }
             if (this.loadMore
-                    && position >= this.itemCount
+                    && position >= this.itemCount - this.listNode.preloadItemCount
                     && !TextUtils.isEmpty(this.listNode.onLoadMoreFuncId)) {
                 callLoadMore();
             }

doric-android/doric/src/main/java/pub/doric/shader/list/ListNode.java

@@ -76,6 +76,8 @@ public class ListNode extends SuperNode<RecyclerView> implements IDoricScrollabl
     private String onScrollEndFuncId;
     private final DoricJSDispatcher jsDispatcher = new DoricJSDispatcher();
 
+    int preloadItemCount = 0;
+
     public ListNode(DoricContext doricContext) {
         super(doricContext);
         this.listAdapter = new ListAdapter(this);
@@ -377,6 +379,12 @@ public class ListNode extends SuperNode<RecyclerView> implements IDoricScrollabl
                 }
                 this.onDraggedFuncId = prop.asString().value();
                 break;
+            case "preloadItemCount":
+                if (!prop.isNumber()) {
+                    return;
+                }
+                this.preloadItemCount = prop.asNumber().toInt();
+                break;
             default:
                 super.blend(view, name, prop);
                 break;