[DataPipe] Fixing `map` function signature validation (#84279)
As @pmeier [points out](https://github.com/pytorch/pytorch/pull/80267#discussion_r958423241), #80267 introduces a bug where an exception is thrown when a built-in function (or a function implemented in C) is used with `.map` because `inspect.signature(fn)` cannot find the function's signature.
This PR skips over a function when its signature cannot be found. I believe this case is rare, and if the `fn` is truly incompatible with the usage of `input_col`/`output_col`, an exception will be raised at run time such that users will be able to examine what is wrong.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/84279
Approved by: https://github.com/pmeier, https://github.com/janeyx99
