feat(reflect): add function_declaration::get_parameters

Author: JohelEGP

source/parse.h

@@ -3323,6 +3323,17 @@ struct declaration_node
         return false;
     }
 
+
+    auto get_function_parameters()
+        -> std::span<std::unique_ptr<parameter_declaration_node>>
+    {
+        if (!is_function()) {
+            return {};
+        }
+        // else
+        return std::get<a_function>(type)->parameters->parameters;
+    }
+
     auto unnamed_return_type_to_string() const
         -> std::string
     {