fix: add a newline and an instantiator to generators

lib/generators/nexus_cqrs/command_generator.rb

@@ -22,7 +22,7 @@ module NexusCqrs
         template('register_cqrs_handlers.rb', handler_config)
       end
 
-      code_to_inject = "$COMMAND_EXECUTOR.register_command(#{full_name}, #{full_name}Handler)"
+      code_to_inject = "$COMMAND_EXECUTOR.register_command(#{full_name}, #{full_name}Handler.new)\n"
 
       inject_into_file(handler_config, code_to_inject, after: "# Register Commands\n")
     end

lib/generators/nexus_cqrs/query_generator.rb

@@ -22,7 +22,7 @@ module NexusCqrs
         template('register_cqrs_handlers.rb', handler_config)
       end
 
-      code_to_inject = "$QUERY_EXECUTOR.register_command(#{full_name}, #{full_name}Handler)"
+      code_to_inject = "$QUERY_EXECUTOR.register_command(#{full_name}, #{full_name}Handler.new)\n"
 
       inject_into_file(handler_config, code_to_inject, after: "# Register Queries\n")
     end