Call hid_init() at import time, to avoid macOS crash

[SomberNight]

fixes #142
fixes #148

note #148 (comment) :

HIDAPI on macOS has an additional issue regarding thread-safety.
I did encountered it in my project(s) but didn't have enough time to gather info/find a root cause.
Looks like on macOS hid_init/hid_exit needs to be called in the same thread,
which is an additional restriction compared to other platforms.

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I have tested on macOS 12.5 (amd64), where using the reproducers in the opening posts of #142 and #148, I can reproduce a SIGILL (without this patch).
With this patch, there is no SIGILL anymore, the sample scripts work as expected.

[SomberNight]

note: I've only tested on macOS so far.

[SomberNight]

important: this PR assumes that hidapi is imported from the main thread. -- as hid_exit will be called from the main thread by:

cython-hidapi/hid.pyx

Line 418 in 8e92053

weakref.finalize(sys.modules[__name__], hid_exit)

and as in #148 (comment), the two calls should happen on the same thread.

EDIT: and in fact the SIGILL from #142 and #148 can still be triggered even with this PR, if import hid is not run on the main thread.

EDIT2: to make this more explicit, one approach we could take is use the warnings module to emit a warning if import hid runs on a thread other than the main thread. I can have a look at that if it seems desired.

[mcuee]

I can confirm with this PR, Issue #148 reproducer no longer crashes under macOS Ventura 13.3.1 with my Mac Mini M1.

Same for Issue 142 reproducer -- it no longer crashes under macOS Ventura 13.3.1 with my Mac Mini M1