[DEV] Done with the Chip selector

lib/Infrastructure/list_extensions.dart

@@ -0,0 +1,20 @@
+extension ListExtension<E> on List<E> {
+  bool containsAll(List<E> otherList) {
+    List<bool> checks = [];
+    //
+    for (E thisElement in otherList) {
+      checks.add(contains(thisElement));
+    }
+    return !checks.contains(false);
+  }
+
+  List<E> getUnique() {
+    List<E> uniqueItems = [];
+    for (E thisElement in this) {
+      if (!uniqueItems.contains(thisElement)) {
+        uniqueItems.add(thisElement);
+      }
+    }
+    return uniqueItems;
+  }
+}