[Feature Request] Add tool decorator for turning a function into a FunctionTool

[lightaime]

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Motivation

Add tool decorator for turning a function into a FunctionTool

Solution

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Alternatives

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Additional context

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[Wendong-Fan]

hey @lightaime , in ChatAgent now we support pass Callable to the tool list and we will covert it into FunctionTool internally, do we still need to add this decorator?

    def _initialize_tools(
        self, tools: List[Union[FunctionTool, Callable]]
    ) -> List[FunctionTool]:
        r"""Helper method to initialize tools as FunctionTool instances."""
        from camel.toolkits import FunctionTool

        func_tools = []
        for tool in tools:
            if not isinstance(tool, FunctionTool):
                tool = FunctionTool(tool)
            func_tools.append(tool)
        return func_tools