Revert "Use declarative setup with pyproject.toml
"
#479
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Reverting #474 while I figure out what's wrong with publishing https://app.circleci.com/pipelines/github/auth0/auth0-python/910/workflows/c6f66dbf-56b4-4253-b01b-837c15695686/jobs/2692/parallel-runs/0/steps/0-104