Move __name__ mangling to end of module

[noahbkim]

Changing __name__ in the middle of the module causes subsequent definitions to have the mangled (and therefore incorrect) __module__, which causes a bad interaction with cloudpickle (which in turn needs to ensure pickled functions can be imported from their __module__). Moving the __name__ change to the end of the module satisfies the DeprecationWarning check while sidestepping the above.

[noahbkim]

Ah, I see these CI failures are already addressed in #155, I'll rebase once that lands

[mikenerone]

Ah, I see these CI failures are already addressed in #155, I'll rebase once that lands

@noahbkim I'm not clear on what's causing the unrelated CI failure in that PR (#155) (only for Python 3.12 on MacOS?!?), and haven't had time to dig into it. I'd welcome an extra set of eyes if you're willing.

[mikenerone]

Given the MacOS testing failures that affected #155, and which got fixed externally (seems like a Mac test environment problem in GHA that was present for a couple of days), I re-ran the failed Mac test for this PR. Indeed, it succeeds.

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