Remove cast operations for bool2d instances

[carlos-adir]

This PR removes the operators __float__ for the classes

• JordanCurve: Use length property instead
• SimpleShape: Use area property instead
• ConnectedShape: Use area property instead
• DisjoinShape: Use area property instead

Also removes __bool__ for SubSetR2.
Only EmptyShape and WholeShape contains this cast operation

[codecov]

Codecov Report

❌ Patch coverage is 94.87179% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.12%. Comparing base (6c8ea03) to head (5c88dda).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/shapepy/bool2d/shape.py	93.75%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   97.90%   98.12%   +0.22%     
==========================================
  Files          28       28              
  Lines        2432     2402      -30     
==========================================
- Hits         2381     2357      -24     
+ Misses         51       45       -6     

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