Add some missing attribute annotations to trace.pyi

[AlexWaygood]

This will be useful for python/cpython#109413

[Avasam]

I have two questions, other than that, this looks good assuming __init__ was already typed correctly*.

1. (see in-code comment about TraceFunction)
2. *infile and outfile look like they could work as file descriptors. The online documentation says "name of the file" specifically, but docstring only says "file" and stub also already accepts Path. I know for the stdlib typeshed sometimes differs from "what's possible" to "do the correct thing", so I'll defer to your judgement here.

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

[AlexWaygood]

Thanks, I made the suggested change regarding localtrace and globaltrace!

2. *infile and outfile look like they could work as file descriptors.

Ehhhh, not sure. In general, I kinda feel like passing file descriptors directly into high-level functions like this is bad practice, and usually only works by accident (rather than the core devs deliberately designing functions in the trace module so that they'll accept file descriptors). My personal feeling is I'm generally happy to consider adding file-descriptor support to stubs if someone asks for it, but otherwise, I'd lean against doing so unless the function is explicitly documented as supporting file descriptors (or it's clear from the git history that file-descriptor support is deliberate, etc.).

[AlexWaygood]

Thanks for the review! :D