Mat at set

[rainyl]

• remove Mat.fromPtr, merge it to Mat.fromMat
• add Mat.atU8, Mat.setU8, etc.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 91.37931% with 5 lines in your changes missing coverage. Please review.

Project coverage is 93.01%. Comparing base (7cda0ee) to head (4a25f0c).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/dartcv/lib/src/core/mat.dart	91.37%	5 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #338      +/-   ##
==========================================
+ Coverage   92.96%   93.01%   +0.04%     
==========================================
  Files          50       50              
  Lines       10591    10635      +44     
==========================================
+ Hits         9846     9892      +46     
+ Misses        745      743       -2     

Flag	Coverage Δ
unittests	93.01% <91.37%> (+0.04%)	⬆️

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