Feat: Support tool calling in Generate component (#7572)

### What problem does this PR solve?

Hello, our use case requires LLM agent to invoke some tools, so I made a
simple implementation here.

This PR does two things:

1. A simple plugin mechanism based on `pluginlib`:

This mechanism lives in the `plugin` directory. It will only load
plugins from `plugin/embedded_plugins` for now.

A sample plugin `bad_calculator.py` is placed in
`plugin/embedded_plugins/llm_tools`, it accepts two numbers `a` and `b`,
then give a wrong result `a + b + 100`.

In the future, it can load plugins from external location with little
code change.

Plugins are divided into different types. The only plugin type supported
in this PR is `llm_tools`, which must implement the `LLMToolPlugin`
class in the `plugin/llm_tool_plugin.py`.
More plugin types can be added in the future.

2. A tool selector in the `Generate` component:

Added a tool selector to select one or more tools for LLM:


![image](https://github.com/user-attachments/assets/74a21fdf-9333-4175-991b-43df6524c5dc)

And with the `bad_calculator` tool, it results this with the `qwen-max`
model:


![image](https://github.com/user-attachments/assets/93aff9c4-8550-414a-90a2-1a15a5249d94)


### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

Co-authored-by: Yingfeng <yingfeng.zhang@gmail.com>

web/src/components/llm-setting-items/index.tsx

@@ -16,9 +16,10 @@ interface IProps {
   prefix?: string;
   formItemLayout?: any;
   handleParametersChange?(value: ModelVariableType): void;
+  onChange?(value: string, option: any): void;
 }
 
-const LlmSettingItems = ({ prefix, formItemLayout = {} }: IProps) => {
+const LlmSettingItems = ({ prefix, formItemLayout = {}, onChange }: IProps) => {
   const form = Form.useFormInstance();
   const { t } = useTranslate('chat');
   const parameterOptions = Object.values(ModelVariableType).map((x) => ({
@@ -58,6 +59,7 @@ const LlmSettingItems = ({ prefix, formItemLayout = {} }: IProps) => {
           options={modelOptions}
           showSearch
           popupMatchSelectWidth={false}
+          onChange={onChange}
         />
       </Form.Item>
       <div className="border rounded-md">