migrate setup.py to pyproject.toml

**Actual Behavior:**
#1973 migrated using setup.py to pyproject.toml. We want to make pyproject consistent through out the repo.


**Context**


_Originally posted by @dshemetov in https://github.com/cmu-delphi/covidcast-indicators/pull/2014#pullrequestreview-2228651795_