Delete setup.py

[ghost]

Fixed here:
https://github.blog/changelog/2023-02-13-dependency-graph-supports-the-python-pep-621-standard/

And it looks like it is working fine in pydantic
pydantic/pydantic#4881

[codecov]

Codecov Report

Merging #398 (15ecb19) into main (e0cd916) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #398   +/-   ##
=======================================
  Coverage   98.66%   98.66%           
=======================================
  Files          11       11           
  Lines        1052     1052           
  Branches      199      199           
=======================================
  Hits         1038     1038           
  Misses          6        6           
  Partials        8        8           

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[samuelcolvin]

Thank you.