Type-hint comments for CarlaDataProvider

[Daraan]

Description

This PR only adds comments that can be picked up by mypy for example and does not modify any code.

So far only type-hints for the CarlaDataProvider so that they can be picked up by IDE extensions to allow for better code completion.

TODO:

• What is the correct type hint for _global_osc_parameters = {} # type: dict[str, Any]?
  From what I found from online resources Any fits bests, the types I've seen where [str, Number, ParameterRef]
• Decide:
• A) Strict: Declare variables that are None before init / after cleanup, like _world, as carla.World | None
• B) Practical: Use their correct type without None and assume initialization and no usage after cleanup.

---

Note: As long as it is no main feature of carla this PR carla-simulator/carla#7009 adds type-hints for carla.

---

This change is 

[PabloVD]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Daraan)

[Daraan]

Sorry, didn't know that this was a request review button.😅

Any opinion on the AB choices,?

[PabloVD]

Thanks for the PR. Given that it is a static class initialized at the beginning, we can ignore Nones. Therefore, we prefer the Practical B choice.

[Daraan]

@PabloVD implemented the B variant by removing most None values, and increased the type-coverage

[PabloVD]

Reviewed 1 of 1 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Daraan)

[PabloVD]

@Daraan thanks for your changes, now we can approve the PR.