feat: add default expand template to tree component

npm/ng-packs/packages/components/tree/src/lib/components/tree.component.html

@@ -38,3 +38,39 @@
     </div>
   </div>
 </ng-template>
+
+<ng-template #defaultIconTemplate let-node let-origin="origin">
+  <i style="line-height: 28px" aria-hidden="true">
+    <ng-container *ngTemplateOutlet="node.isExpanded ? minusIcon : plusIcon"></ng-container
+  ></i>
+</ng-template>
+
+<ng-template #minusIcon>
+  <svg
+    width="15"
+    height="15"
+    viewBox="0 0 24 24"
+    xmlns="http://www.w3.org/2000/svg"
+    fill-rule="evenodd"
+    clip-rule="evenodd"
+  >
+    <path
+      d="M11.5 0c6.347 0 11.5 5.153 11.5 11.5s-5.153 11.5-11.5 11.5-11.5-5.153-11.5-11.5 5.153-11.5 11.5-11.5zm0 1c5.795 0 10.5 4.705 10.5 10.5s-4.705 10.5-10.5 10.5-10.5-4.705-10.5-10.5 4.705-10.5 10.5-10.5zm-6.5 10h13v1h-13v-1z"
+    />
+  </svg>
+</ng-template>
+
+<ng-template #plusIcon>
+  <svg
+    width="15"
+    height="15"
+    viewBox="0 0 24 24"
+    xmlns="http://www.w3.org/2000/svg"
+    fill-rule="evenodd"
+    clip-rule="evenodd"
+  >
+    <path
+      d="M11.5 0c6.347 0 11.5 5.153 11.5 11.5s-5.153 11.5-11.5 11.5-11.5-5.153-11.5-11.5 5.153-11.5 11.5-11.5zm0 1c5.795 0 10.5 4.705 10.5 10.5s-4.705 10.5-10.5 10.5-10.5-4.705-10.5-10.5 4.705-10.5 10.5-10.5zm.5 10h6v1h-6v6h-1v-6h-6v-1h6v-6h1v6z"
+    />
+  </svg>
+</ng-template>