Moves getTree to interface

Author: kimpepper

src/NestedSetInterface.php

@@ -114,4 +114,12 @@ public function moveSubTreeAfter(Node $target, Node $node);
    */
   public function getNodeAtPosition($left);
 
+  /**
+   * Fetches the entire tree.
+   *
+   * @return array
+   *   The tree.
+   */
+  public function getTree();
+
 }

src/Node.php

@@ -43,7 +43,7 @@ class Node {
   protected $depth;
 
   /**
-   * node constructor.
+   * Node constructor.
    *
    * @param int|string $id
    *   The ID.

src/Storage/DbalNestedSet.php

@@ -145,10 +145,7 @@ public function findAncestors(Node $node) {
   }
 
   /**
-   * Fetches the entire tree.
-   *
-   * @return array
-   *   The tree.
+   * {@inheritdoc}
    */
   public function getTree() {
     $tree = [];