feat: Support variable assign dict array value config

Author: liuruibin

apps/application/flow/step_node/variable_assign/impl/base_variable_assign_node.py

@@ -24,7 +24,10 @@ def execute(self, variable_list, stream, **kwargs) -> NodeResult:
                 }
                 if variable['source'] == 'custom':
                     if variable['type'] in ['dict', 'array']:
-                        val = json.loads( variable['value'])
+                        if isinstance(variable['value'], dict) or isinstance(variable['value'], list):
+                            val = variable['value']
+                        else:
+                            val = json.loads(variable['value'])
                         self.workflow_manage.context[variable['fields'][1]] = val
                         result['output_value'] = variable['value'] = val
                     else: