Add center property to Interval and BoundingBox to simplify shape calculations

[stefmolin]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.52%. Comparing base (2041588) to head (321e75f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #263   +/-   ##
=======================================
  Coverage   98.51%   98.52%           
=======================================
  Files          58       58           
  Lines        1891     1898    +7     
  Branches      112      112           
=======================================
+ Hits         1863     1870    +7     
  Misses         25       25           
  Partials        3        3           

Files with missing lines	Coverage Δ
src/data_morph/bounds/bounding_box.py	100.00% <100.00%> (ø)
src/data_morph/bounds/interval.py	100.00% <100.00%> (ø)
src/data_morph/shapes/points/club.py	100.00% <100.00%> (ø)
src/data_morph/shapes/points/heart.py	100.00% <100.00%> (ø)
src/data_morph/shapes/points/spade.py	100.00% <100.00%> (ø)
tests/bounds/test_bounding_box.py	100.00% <100.00%> (ø)
tests/bounds/test_interval.py	100.00% <100.00%> (ø)