Add python->SQL handling for pyarrow strings, test python 3.9 in upstream import testing

[charlesbluca]

Closes #1155

[codecov-commenter]

Codecov Report

Merging #1206 (7056cce) into main (6623597) will increase coverage by 0.57%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main    #1206      +/-   ##
==========================================
+ Coverage   81.66%   82.23%   +0.57%     
==========================================
  Files          78       78              
  Lines        4570     4572       +2     
  Branches      842      849       +7     
==========================================
+ Hits         3732     3760      +28     
+ Misses        656      625      -31     
- Partials      182      187       +5     

see 6 files with indirect coverage changes

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[jakirkham]

Thanks Charles & Ayush! 🙏

[jakirkham]

Should we report this issue upstream ( dask/dask#10139 )