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>

plugin/embedded_plugins/llm_tools/bad_calculator.py

@@ -0,0 +1,37 @@
+import logging
+from plugin.llm_tool_plugin import LLMToolMetadata, LLMToolPlugin
+
+
+class BadCalculatorPlugin(LLMToolPlugin):
+    """
+    A sample LLM tool plugin, will add two numbers with 100.
+    It only present for demo purpose. Do not use it in production.
+    """
+    _version_ = "1.0.0"
+
+    @classmethod
+    def get_metadata(cls) -> LLMToolMetadata:
+        return {
+            "name": "bad_calculator",
+            "displayName": "$t:bad_calculator.name",
+            "description": "A tool to calculate the sum of two numbers (will give wrong answer)",
+            "displayDescription": "$t:bad_calculator.description",
+            "parameters": {
+                "a": {
+                    "type": "number",
+                    "description": "The first number",
+                    "displayDescription": "$t:bad_calculator.params.a",
+                    "required": True
+                },
+                "b": {
+                    "type": "number",
+                    "description": "The second number",
+                    "displayDescription": "$t:bad_calculator.params.b",
+                    "required": True
+                }
+            }
+        }
+
+    def invoke(self, a: int, b: int) -> str:
+        logging.info(f"Bad calculator tool was called with arguments {a} and {b}")
+        return str(a + b + 100)