Implements Feature Extractors

Implements the feature extractors from SB3 in JAX

Description

Achieving feature parity with SB3

[x] I have raised an issue to propose this change (required for new features and bug fixes)

closes #3

[ ] Bug fix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)
[ ] Documentation (update in the documentation)

[ ] I've read the CONTRIBUTION guide (required)
[ ] I have updated the changelog accordingly (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.
[ ] I have reformatted the code using make format (required)
[ ] I have checked the codestyle using make check-codestyle and make lint (required)
[ ] I have ensured make pytest and make type both pass. (required)
[ ] I have checked that the documentation builds using make doc (required)

Note: You can run most of the checks using make commit-checks.

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