Add ptemcee from yonatank93's repo as dependency

[mjwen]

Make ptemcee from @yonatank93's fored repo as a dependency in setup.py.

To install it for tests, one can use pip install -e ".[test]" for example.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.07%. Comparing base (15fdf23) to head (bdbbb2a).
Report is 16 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #193   +/-   ##
=======================================
  Coverage   65.07%   65.07%           
=======================================
  Files          41       41           
  Lines        4075     4075           
=======================================
  Hits         2652     2652           
  Misses       1423     1423           

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