Feat: add data type invoke (#5126)

### What problem does this PR solve?
```
Invoke agent
To be able to interact dynamically with the API, there is a customizable Data Type JSON or FormData, the default is JSON 
```

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

web/src/pages/flow/form/invoke-form/index.tsx

@@ -69,6 +69,15 @@ const InvokeForm = ({ onValuesChange, form, node }: IOperatorForm) => {
         >
           <Switch />
         </Form.Item>
+        <Form.Item name={'datatype'} label={t('flow.datatype')}>
+          <Select
+            options={[
+              { value: 'json', label: 'application/json' },
+              { value: 'formdata', label: 'multipart/form-data' },
+            ]}
+            allowClear={true}
+          ></Select>
+        </Form.Item>
         <DynamicVariablesForm node={node}></DynamicVariablesForm>
       </Form>
     </>