Optimize `LineCollection`

[JCGoran]

As requested in https://github.com/stefmolin/data-morph/pull/198#discussion_r1685782050, this is now a separate PR.

Describe your changes

• remove LineCollection._distance_point_to_line method as it's not used anywhere anymore
• use numpy vectorized ops when calling LineCollection.distance, resulting in about 100M less function calls for the star shape
• (subject to change) make LineCollection initializer raise a ValueError if any of the lines is actually a point (i.e. start == end) and add a test for it

Checklist

• [x] Test cases have been modified/added to cover any code changes.
• [x] Docstrings have been modified/created for any code changes.
• [x] All linting and formatting checks pass (see the contributing guidelines for more information).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.41%. Comparing base (51b8d26) to head (36d6c94). Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #206      +/-   ##
==========================================
- Coverage   98.42%   98.41%   -0.01%     
==========================================
  Files          43       43              
  Lines        1775     1766       -9     
  Branches      358      357       -1     
==========================================
- Hits         1747     1738       -9     
  Misses         25       25              
  Partials        3        3              

Files with missing lines	Coverage Δ
src/data_morph/shapes/bases/line_collection.py	91.89% <100.00%> (-0.42%)	:arrow_down:
tests/shapes/bases/test_line_collection.py	100.00% <100.00%> (ø)