Add Cython build infra + initial extension module #45

Job	Run time
Minimal Supported Dependencies	8m 57s
Vanilla Python 3.10 on windows	10m 35s
Docs, Examples, and Eval	19s
Vanilla Python 3.10 on ubuntu	9m 7s
Conda Python 3.10 on macos	8m 18s
Vanilla Python 3.11 on windows	10m 35s
Conda Python 3.10 on windows	8m 59s
Vanilla Python 3.11 on ubuntu	9m 28s
Conda Python 3.10 on ubuntu	10m 41s
Conda Python 3.11 on macos	8m 48s
Conda Python 3.11 on windows	10m 6s
Conda Python 3.11 on ubuntu	10m 43s
Test Suite Results	1s
	1h 46m 37s

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