HF datasets version fix

[sanjanag]

CI fixes:

• Install different versions of datasets for different python versions. Can't use same version as datasets dropped support for python3.7 in version 2.14.0 and it breaks tests using datasets library.
• Use black formatting for jupyter notebooks as well
• Update versions of black and flake8 precommit hooks
• Ignore flake8 error E704 as it is conflicting with black formatting
• Add target versions for black in CI pipeline and only use check option and not modify the files.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (af3fc3f) 95.84% compared to head (dd1e190) 96.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
+ Coverage   95.84%   96.04%   +0.19%     
==========================================
  Files          16       16              
  Lines         987      985       -2     
  Branches      194      194              
==========================================
  Hits          946      946              
+ Misses         21       19       -2     
  Partials       20       20              

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[elisno]

LGTM.