Speed up by mypyc transpilation

[nstarman]

https://mypyc.readthedocs.io/en/latest/introduction.html#introduction

Requires type hinting

[asmeurer]

Is the performance bad? I would expect most of the time is spent in pyflakes. Maybe ruff can be used instead to provide a boost. Does it expose all the necessary information?

[nstarman]

People at Astropy have noticed it's the slowest step in our pre-commit.

[nstarman]

I'm not sure about ruff's python API. But that would presumably be much faster

[asmeurer]

They don't have one yet, but using it as a subprocess may be fast enough. astral-sh/ruff#659

[asmeurer]

Also would be a good idea to profile this to see if that actually is why it's slow.