OpenSource/ragflow - ragflow - 浩瀚星图

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>

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PLUGIN_TYPE_LLM_TOOLS = "llm_tools"