add xobjdetect and ximgproc modules

[rainyl]

• xobjdetect
  • WBDetector
• ximgproc
  • cv::ximgproc::anisotropicDiffusion
  • cv::ximgproc::edgePreservingFilter
  • cv::ximgproc::findEllipses
  • cv::ximgproc::niBlackThreshold
  • cv::ximgproc::PeiLinNormalization
  • cv::ximgproc::thinning
  • Structured forests for fast edge detection
  • EdgeBoxes
  • Filters
  • Superpixels
  • Image segmentation
  • Fast line detector
  • EdgeDrawing
  • Fourier descriptors
  • Binary morphology on run-length encoded image
• Tests

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 92.60970% with 32 lines in your changes missing coverage. Please review.

Project coverage is 91.82%. Comparing base (d32cba6) to head (938effd).

Files	Patch %	Lines
lib/src/contrib/ximgproc.dart	95.61%	15 Missing ⚠️
lib/src/core/point.dart	82.85%	12 Missing ⚠️
lib/src/core/mat.dart	69.23%	4 Missing ⚠️
lib/src/core/size.dart	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #72      +/-   ##
==========================================
+ Coverage   91.38%   91.82%   +0.43%     
==========================================
  Files          57       56       -1     
  Lines        7828     8161     +333     
==========================================
+ Hits         7154     7494     +340     
+ Misses        674      667       -7     

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