Fix hard and soft solver and add progress bar

[kotarot]

No description provided.

[codecov]

Codecov Report

Merging #32 (76781fc) into main (84c37e4) will increase coverage by 0.13%.
The diff coverage is 97.01%.

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   92.61%   92.75%   +0.13%     
==========================================
  Files           8        8              
  Lines         352      345       -7     
==========================================
- Hits          326      320       -6     
+ Misses         26       25       -1     

Flag	Coverage Δ
unittests	92.75% <97.01%> (+0.13%)	⬆️

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Impacted Files	Coverage Δ
rectangle_packing_solver/solver.py	95.89% <97.01%> (+0.46%)	⬆️

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