New API: cv.Subdiv2D

[rainyl]

• add triangle function #56

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.29730% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 88.89%. Comparing base (97a7d1d) to head (d469061).

Files	Patch %	Lines
lib/src/imgproc/subdiv2d.dart	97.29%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
+ Coverage   88.76%   88.89%   +0.12%     
==========================================
  Files          34       36       +2     
  Lines        4789     4898     +109     
==========================================
+ Hits         4251     4354     +103     
- Misses        538      544       +6     

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