…hread

Change `trace_to_thread` method to retrieve the function name from the
`func` attribute of the `functools.partial` instance.

> partial objects are like function objects in that they are callable, weak
> referenceable, and can have attributes. There are some important differences.
> For instance, the __name__ and function.__doc__ attributes are not created
> automatically. Also, partial objects defined in classes behave like static
> methods and do not transform into bound methods during instance attribute
> look-up.
>
> Reference: https://docs.python.org/3.12/library/functools.html#partial-objects