Improve ergonomics of using @deprecate_arg and @deprecate_func in other repos

[Eric-Arellano]

While #9676 lets other repos set package_name, that is annoying to have to do every single call. It's also easy to forget!

How can we improve this? Some unexplored ideas:

• Try to automate some of it by e.g. looking at the __module__.
• Applications wrap the decorators and set package_name automatically, i.e. argument fixing / function currying.
• Applications mutate some global variable?

[Eric-Arellano]

Imo this is low priority. It would still be neat, but seems unlikely we'll get to this. Feel free to reopen if others disagree.