move sub-functions of value impls to concrete types

Signed-off-by: Folling <mail@folling.io>

src/values/text_value.hpp

@@ -20,5 +20,6 @@ public:
     ~IkarusTextValue() override = default;
 
 public:
-    boost::variant2::variant<boost::variant2::monostate, boost::container::vector<data_type>> data{};
+    boost::variant2::variant<boost::variant2::monostate, boost::container::small_vector<data_type, SMALL_VEC_VALUE_SIZE>> data{
+    };
 };