Motility constructors kwargs

[mastrof]

Closes #91

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.79%. Comparing base (c75eed9) to head (cd503d8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
+ Coverage   39.33%   39.79%   +0.45%     
==========================================
  Files          24       24              
  Lines         572      578       +6     
==========================================
+ Hits          225      230       +5     
- Misses        347      348       +1     

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