[Refactor] Update all instances of exploration `*Wrapper` to `*Module`

Description

Update instances of

AdditiveGaussianWrapper --> AdditiveGaussianModule
OrnsteinUhlenbeckProcessWrapper --> OrnsteinUhlenbeckProcessModule

everywhere in the code base, except in test/test_exploration.py, which should still test both the wrappers and modules until we finally remove the wrappers in the future.

Motivation and Context

close #2295

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Types of changes

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Checklist

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[ ] My change requires a change to the documentation.
[x] I have updated the tests accordingly (required for a bug fix or a new feature).
[ ] I have updated the documentation accordingly.

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2298

:page_facing_up: Preview Python docs built from this PR

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:x: 3 New Failures, 1 Pending, 3 Unrelated Failures

As of commit 085bef26bbae6455947ab75572185d45c50bdcb8 with merge base bdc97846dbcaffbd62da8f24aecce437fde9f60b ():

NEW FAILURES - The following jobs have failed:

* [Continuous Benchmark (PR) / CPU Pytest benchmark](https://hud.pytorch.org/pr/pytorch/rl/2298#27735460591) ([gh](https://github.com/pytorch/rl/actions/runs/10036865150/job/27735460591)) `Workflow failed! Resource not accessible by integration` * [Continuous Benchmark (PR) / GPU Pytest benchmark](https://hud.pytorch.org/pr/pytorch/rl/2298#27735459973) ([gh](https://github.com/pytorch/rl/actions/runs/10036865150/job/27735459973)) `Workflow failed! Resource not accessible by integration` * [Habitat Tests on Linux / tests (3.9, 12.1) / linux-job](https://hud.pytorch.org/pr/pytorch/rl/2298#27735461584) ([gh](https://github.com/pytorch/rl/actions/runs/10036865167/job/27735461584)) `RuntimeError: Command docker exec -t ba7908e7c0e8344ef0340e0037bf3eac7930d57ae660aeae20bf2a7649045a38 /exec failed with exit code 139`

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

* [Libs Tests on Linux / unittests-gym (3.9, 12.1) / linux-job](https://hud.pytorch.org/pr/pytorch/rl/2298#27735466988) ([gh](https://github.com/pytorch/rl/actions/runs/10036865174/job/27735466988)) ([trunk failure](https://hud.pytorch.org/pytorch/rl/commit/bdc97846dbcaffbd62da8f24aecce437fde9f60b#27674786692)) `AttributeError: module 'torch' has no attribute 'compiler'` * [Unit-tests on Linux / tests-olddeps (3.8, 11.6) / linux-job](https://hud.pytorch.org/pr/pytorch/rl/2298#27735464766) ([gh](https://github.com/pytorch/rl/actions/runs/10036865177/job/27735464766)) ([trunk failure](https://hud.pytorch.org/pytorch/rl/commit/bdc97846dbcaffbd62da8f24aecce437fde9f60b#27674785660)) `AttributeError: module 'torch' has no attribute 'compiler'` * [Unit-tests on Windows / unittests-cpu / windows-job](https://hud.pytorch.org/pr/pytorch/rl/2298#27735460578) ([gh](https://github.com/pytorch/rl/actions/runs/10036865185/job/27735460578)) ([trunk failure](https://hud.pytorch.org/pytorch/rl/commit/bdc97846dbcaffbd62da8f24aecce437fde9f60b#27674782343)) `test/test_transforms.py::TestActionDiscretizer::test_trans_parallel_env_check[False]`

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pytorch / rl