Implement Polygamma Op

[ricardoV94]

Closes #499

[codecov-commenter]

Codecov Report

Merging #505 (f48ed5e) into main (f6be521) will increase coverage by 0.00%.
The diff coverage is 75.67%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #505   +/-   ##
=======================================
  Coverage   80.77%   80.77%           
=======================================
  Files         162      162           
  Lines       46105    46136   +31     
  Branches    11266    11272    +6     
=======================================
+ Hits        37240    37266   +26     
- Misses       6638     6640    +2     
- Partials     2227     2230    +3     

Files	Coverage Δ
pytensor/gradient.py	76.82% <ø> (ø)
pytensor/tensor/math.py	90.18% <100.00%> (+0.01%)	⬆️
pytensor/tensor/rewriting/math.py	86.50% <100.00%> (+0.03%)	⬆️
pytensor/scalar/math.py	88.97% <68.96%> (-0.27%)	⬇️