use koay method for estimation of Rice parameters

[aloctavodia]

hopefully, this will provide a more robust result for maxent when used for the Rice distribution

closes #250

[codecov-commenter]

Codecov Report

Merging #251 (66a2a45) into main (6d2d7fe) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #251      +/-   ##
==========================================
+ Coverage   83.20%   83.28%   +0.07%     
==========================================
  Files          29       29              
  Lines        3757     3774      +17     
==========================================
+ Hits         3126     3143      +17     
  Misses        631      631              

Impacted Files	Coverage Δ
preliz/tests/test_maxent.py	100.00% <ø> (ø)
preliz/tests/test_quartile.py	100.00% <ø> (ø)
preliz/distributions/continuous.py	91.51% <100.00%> (ø)
preliz/internal/optimization.py	100.00% <100.00%> (ø)