added collection, collection proxy and collection resolver implementations

include/matador/sql/internal/query_result_impl.hpp

@@ -129,6 +129,7 @@ public:
     auto resolver = resolver_factory_->resolver<value_type>();
 
     if (attr.fetch() == utils::fetch_type::Lazy) {
+
       // pk_reader_.read(*id, column_index_++);
     } else {
       const auto ti = std::type_index(typeid(value_type));

include/matador/sql/internal/resolver_producer.hpp

@@ -10,7 +10,7 @@ class executor;
 class resolver_producer {
 public:
   virtual ~resolver_producer() = default;
-  virtual std::shared_ptr<object::abstract_object_resolver> produce(executor &exec) = 0;
+  virtual std::shared_ptr<object::abstract_type_resolver> produce(executor &exec) = 0;
 
   [[nodiscard]] const std::type_index& type() const;