bpo-1635741: Port _crypt extension module to multiphase initialization(PEP 489)

[shihai1991]

https://bugs.python.org/issue1635741

[codecov]

Codecov Report

Merging #18404 into master will increase coverage by 1.07%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #18404       +/-   ##
===========================================
+ Coverage   82.11%   83.19%    +1.07%     
===========================================
  Files        1955     1570      -385     
  Lines      588851   414397   -174454     
  Branches    44428    44429        +1     
===========================================
- Hits       483552   344761   -138791     
+ Misses      95647    59991    -35656     
+ Partials     9652     9645        -7     

Impacted Files	Coverage Δ
Lib/distutils/tests/test_bdist_rpm.py	30.00% <0.00%> (-65.00%)	⬇️
Lib/distutils/command/bdist_rpm.py	7.63% <0.00%> (-56.88%)	⬇️
Lib/test/test_urllib2net.py	76.92% <0.00%> (-13.85%)	⬇️
Lib/test/test_smtpnet.py	78.57% <0.00%> (-7.15%)	⬇️
Lib/ftplib.py	63.85% <0.00%> (-6.06%)	⬇️
Lib/test/test_ftplib.py	87.11% <0.00%> (-4.72%)	⬇️
Tools/scripts/db2pickle.py	17.82% <0.00%> (-3.97%)	⬇️
Tools/scripts/pickle2db.py	16.98% <0.00%> (-3.78%)	⬇️
Lib/test/test_socket.py	71.94% <0.00%> (-3.77%)	⬇️
Lib/test/test_asyncio/test_base_events.py	91.84% <0.00%> (-3.30%)	⬇️
... and 440 more

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[shihai1991]

@vstinner @ncoghlan @encukou Hi, folks. About porting extension module to pep-489, some extension module have no maintainer or non-active maintainer. So I invite petr(as pep-489 author)、nick(as pep-489 author) and victor(as performance master) help me review a serious of PRs :)

[vstinner]

Thanks, merged.

[shihai1991]

thanks, victor.