feat: add a getter for the endif line in VariationNode

Author: eugen-shulimov

src/main/java/org/variantsync/diffdetective/variation/diff/Projection.java

@@ -121,4 +121,9 @@ public Node getFormula() {
     public int getID() {
         return getBackingNode().getID();
     }
+
+    @Override
+    public String getEndIf() {
+        return getBackingNode().getEndIf();
+    }
 };

src/main/java/org/variantsync/diffdetective/variation/tree/VariationNode.java

@@ -113,6 +113,12 @@ public VariationNode<T, L> downCast() {
      */
     public abstract List<T> getChildren();
 
+    /**
+     * Returns the line with the endif of the corresponding if, if the node is an if node, otherwise null
+     * @return String, the Line with endif
+     */
+    public abstract String getEndIf();
+
     /**
      * Returns {@code true} iff this node has no parent.
      *