[Do not review] add pygen as a base

[justinchuby]

Stack from ghstack (oldest at bottom):

• feat(atenlib): aten function signature generator #212
• feat(atenlib): create tests with OpInfo #208
• feat(atenlib): establish the aten-lib directory #202
• -> [Do not review] add pygen as a base #203

[github-advanced-security]

lintrunner found more than 10 potential problems in the proposed changes. Check the Files changed tab for more details.

[codecov]

Codecov Report

Merging #203 (e5a165f) into gh/justinchuby/2/base (c237cb5) will not change coverage.
The diff coverage is n/a.

@@                  Coverage Diff                   @@
##           gh/justinchuby/2/base     #203   +/-   ##
======================================================
  Coverage                  81.46%   81.46%           
======================================================
  Files                         67       67           
  Lines                       5054     5054           
======================================================
  Hits                        4117     4117           
  Misses                       937      937           

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