Minor cleaning in BaseEnv classes

[matteobettini]

Description

This cahnge adds annotations for abstract methods and fixes a repeated override

Motivation and Context

Code cleaning

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• Documentation (update in the documentation)
• Example (update in the folder of examples)

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• I have read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.

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[vmoens]

LGTM thanks!

[vmoens]

There's an error coming from the fact that some mocking envs in the tests don't have a _set_seed method. If you move the abstractmethod there these mocks should be adapted.

[vmoens]

For the linting, check

https://github.com/pytorch/rl/blob/main/CONTRIBUTING.md

TL;DR running pre-commit will do the work!

[matteobettini]

Oh ok sorry missed that, when I finish travelling I’ll look into updating the tests