Update the spaces for complete type hinting (and updates numpy to 1.21)

[pseudo-rnd-thoughts]

A lot of the spaces in Gymnasium have partial type hints, are missing type hints or have incorrect type hints

This PR fixes and adds a number of type hints in Spaces using the np.NDArray type hints that allows the dtype of a numpy array to be specified.

The aim of this PR is to enable the GeneralTypeHint in pyright for future PRs

One of the requirements of this PR is np.typing.NDArray which was introduced in 1.21.0 to numpy.

[pseudo-rnd-thoughts]

This waiting for the python 3.6 PR to be merged

[RedTachyon]

There's a bunch of comments, a good chunk of them being rather pedantic (but many of the changes themselves are pedantic as well, so if we're doing it, we need to do it right)

Most notably I don't really like the pattern of putting Something[Any] everywhere, it doesn't add any information and is just additiona visual clutter.

Also many of the comments apply to multiple places in the code, I didn't comment each individual instance to avoid 100+ review comments

[RedTachyon]

One small stylistic comment, I'm fine with everything else (but check the CI, it might have been failing outside of the gitlab/github mess)