Replace constants PI/TWOPI with numpy

[timothy-nunn]

Replaces use of our own constants.PI and constants.TWOPI with np.pi and 2.0 * np.pi, respectively.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.04%. Comparing base (b06890b) to head (08744af).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3995      +/-   ##
==========================================
- Coverage   46.04%   46.04%   -0.01%     
==========================================
  Files         123      123              
  Lines       28962    28961       -1     
==========================================
- Hits        13336    13335       -1     
  Misses      15626    15626              

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