Support Windows

[achimnol]

Yes, I just bought a new Windows desktop.

[codecov]

Codecov Report

Merging #26 (de710d4) into main (17b47b9) will decrease coverage by 13.99%.
The diff coverage is 36.05%.

@@             Coverage Diff             @@
##             main      #26       +/-   ##
===========================================
- Coverage   72.34%   58.34%   -14.00%     
===========================================
  Files          10       13        +3     
  Lines         846     1030      +184     
===========================================
- Hits          612      601       -11     
- Misses        234      429      +195     

Impacted Files	Coverage Δ
src/aiotools/compat.py	70.00% <0.00%> (-30.00%)	⬇️
src/aiotools/fork_windows.py	0.00% <0.00%> (ø)
src/aiotools/fork.py	76.19% <73.68%> (+29.52%)	⬆️
src/aiotools/fork_unix.py	77.04% <77.04%> (ø)
src/aiotools/fork_base.py	77.77% <77.77%> (ø)
src/aiotools/context.py	36.27% <0.00%> (-58.83%)	⬇️
src/aiotools/taskgroup.py	89.15% <0.00%> (-1.21%)	⬇️
... and 1 more

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[youknowone]

if this patch will take time, could you consider to merge #47 first?