[BEAM-10185] Build python wheels on GitHub Actions for Windows [dependent on BEAM-10184]

[TobKed]

dependent on #11877
Subtask of BEAM-9388

Example GitHub Action runs available on my fork: https://github.com/TobKed/beam/actions?query=branch%3Agithub-actions-build-wheels-windows

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Post-Commit Tests Status (on master branch)

Lang	SDK	Apex	Dataflow	Flink	Gearpump	Samza	Spark
Go		---	---		---	---
Java
Python		---			---	---
XLang	---	---	---		---	---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website
Non-portable
Portable	---		---	---

See .test-infra/jenkins/README for trigger phrase, status and link of all Jenkins jobs.

[TobKed]

Hi @robertwb, I've found your are Cython specialist. Could you take a quick look on this draft please?
There is a problem with c libraries on windows and I don't know how to solve it.
The only problematic file is sdks/python/apache_beam/runners/worker/statesampler_fast.pyx, if I ignore it then build will finish successfully. The first problem is with unistd.h, after some ugly workarounds for unistd.h i got problems with methods from time.h.
I would appreciate any suggestions.

[TobKed]

@damgad since you have some significant progress in building python wheels on wndows I am closing this PR and waiting for yours

[robertwb]

We've been avoiding doing any cythonization at all on Windows due to issues like this due to statesampler_fast using (unavailable on Windows) posix APIs. It may be possible to skip just this file, rather than everything, on Windows.

[damgad]

@robertwb I've already written windows versions for the missing posix functions. Please take a look @robertwb#12172