LibWeb: Implement Range.intersectsNode

Author: https://github.com/Lubrsi
Commit: 386ee5ab17
Pull-request: https://github.com/SerenityOS/serenity/pull/12774

Userland/Libraries/LibWeb/DOM/Range.h

@@ -57,6 +57,8 @@ public:
         // Note: Its functionality (disabling a Range object) was removed, but the method itself is preserved for compatibility.
     }
 
+    bool intersects_node(Node const&) const;
+
 private:
     explicit Range(Document&);