some improvements to select_query_builder and started insert_query_builder

test/models/recipe.hpp

@@ -9,6 +9,7 @@
 #include "matador/object/many_to_many_relation.hpp"
 
 #include <string>
+#include <utility>
 
 namespace matador::test {
 struct recipe;
@@ -39,10 +40,14 @@ struct recipe {
   object::collection<object::object_ptr<ingredient> > ingredients{};
 
   recipe() = default;
-
   recipe(const unsigned int id, std::string name)
   : id(id), name(std::move(name)) {
   }
+  recipe(const unsigned int id, std::string name, std::vector<object::object_ptr<ingredient>> ings)
+  : id(id)
+  , name(std::move(name))
+  , ingredients(std::move(ings)){
+  }
 
   template<class Operator>
   void process(Operator &op) {