update setup.py

[beliaev-maksim]

• remove stub files from the package
• add typing_extensions
• fix setup.py test (tests did not work)

[codecov]

Codecov Report

Merging #538 (a80ae1b) into master (2a049bd) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #538   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines         2454      2454           
=========================================
  Hits          2454      2454           

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