[Proposal] Relocate wrapper tests

[RedTachyon]

Proposal

This is basically my inner pedant speaking. The tests for wrappers are all sitting in gym/wrappers, when there's a perfectly fine (and empty) gym/wrappers/tests directory sitting there, so they should be moved there.

Motivation

Despaghettification of the file/directory structure

Pitch

Put wrappers tests into wrappers/tests

Alternatives

Live with it.

Additional context

The one case where I see this being breaking in any way if someone imports the tests from gym with hardcoded paths and uses them in downstream code, which feels cursed and I really hope nobody does that.

Also in theory it's possible that one of the tests is written in a way that requires it to be in gym/wrappers (e.g. with relative imports), but from a quick glance I don't see anything like that, and if there were, it'd be worth fixing (and would trivially appear when running tests)

I can make a quick PR later today and pray that nothing breaks.

Checklist

• I have checked that there is no similar issue in the repo (required)

[jkterry1]

There's also a tests/gym/wrappers. My preference would to move all tests into the format of tests/xxx, e.g. tests/wrappers, tests/envs, etc.

[jkterry1]

Closing in favor of PR