Fix bearing saving method

[jguarato]

For some specific bearing classes (e.g. BallBearingElement, RollerBearingElement, BearingFluidFlow, CylindricalBearing), the save to .toml file method was unable to save the names of these classes due to inconsistencies between their initialization arguments and the class attributes. These issues have now been fixed and the names of the respective classes are now effectively stored in the output file to be later loaded as defined by the user.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.42%. Comparing base (f6ca34f) to head (36cab38).
Report is 13 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1118      +/-   ##
==========================================
- Coverage   84.52%   84.42%   -0.10%     
==========================================
  Files          35       35              
  Lines        7966     8002      +36     
==========================================
+ Hits         6733     6756      +23     
- Misses       1233     1246      +13     

Files with missing lines	Coverage Δ
ross/bearing_seal_element.py	92.90% <100.00%> (+0.30%)	⬆️
ross/element.py	87.03% <100.00%> (+0.24%)	⬆️
ross/rotor_assembly.py	93.87% <ø> (ø)

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