[Util] Better tracing for serializability errors

[Oblynx]

Description

In inspect_serializability, when reporting that something isn't serializable, we could in some cases give more info as to the location of the offending object. For example, in _inspect_func_serialization, we could add a log line like this:

f"In {parent.__name__}:{base_obj}:"

This would help a lot in localizing the issues.

Use case

I'm trying to effectively use already existing code as .map steps in Ray Data. The already existing code is likely to be non-serializable.