Make FunctionToolsetTool public

[HamzaFarhan]

Can we make FunctionToolsetTool public? To subclass FunctionToolset and implement a custom call_tool without getting:

"_FunctionToolsetTool" is private and used outside of the module in which it is declared

[DouweM]

This is done in #2458 among other things, I expect that to merge today!

Note that it may be more appropriate to use a WrapperToolset (https://ai.pydantic.dev/toolsets/#changing-tool-execution) or fully custom AbstractToolset (https://ai.pydantic.dev/toolsets/#building-a-custom-toolset) than to subclass FunctionToolset. I'd need to know exactly what you're trying to do to know for sure.

[HamzaFarhan]

I noticed that for a certain set of tools, I would use ctx.deps to modify the first arg called file_path
The same 3 lines of code at the start of every tool.
So these tools don't really need ctx if I can modify the call_tool of my toolset and just add those 3 lines.
That way, the tools are independent of pydantic-ai and just plain functions.