Feat: Make matplotlib optional

[ajhynes7]

No description provided.

[Copilot]

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

src/skspatial/plotting.py:11

• Add tests to simulate the absence of Matplotlib, ensuring that the ImportError with the correct message is raised when plotting functions are called.

except ImportError as error:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.80%. Comparing base (c5cb146) to head (67d35f0).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #366      +/-   ##
==========================================
- Coverage   99.80%   99.80%   -0.01%     
==========================================
  Files          21       21              
  Lines        1041     1033       -8     
==========================================
- Hits         1039     1031       -8     
  Misses          2        2              

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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