Updates to copyright years, cast policy, and pre-commit

[brandonwillard]

I've update the step size dtypes to int64, but I imagine it would be better to perform that conversion somewhere within AeHMC; however, I don't know the best place for that at the moment.

@rlouf, if you get a minute, tell me where you think an astype could be performed so that users can specify int32 and avoid those Scan casting issues.

[codecov[bot]]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage :thumbsup:

Coverage data is based on head (70f839b) compared to base (a459753). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

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