Feat: Add Graph structure to decide the boundary of shapes

[carlos-adir]

Solves #14

[codecov]

Codecov Report

❌ Patch coverage is 98.31144% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.12%. Comparing base (04bb61c) to head (11332e7).

Files with missing lines	Patch %	Lines
src/shapepy/bool2d/graph.py	98.45%	5 Missing ⚠️
src/shapepy/bool2d/boolean.py	97.63%	3 Missing ⚠️
src/shapepy/tools.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
- Coverage   99.34%   99.12%   -0.23%     
==========================================
  Files          40       41       +1     
  Lines        3665     3997     +332     
==========================================
+ Hits         3641     3962     +321     
- Misses         24       35      +11     

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