add asVec() to List extensions

[rainyl]

fix: #221 #220

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 82.97872% with 8 lines in your changes missing coverage. Please review.

Project coverage is 91.15%. Comparing base (62d50b2) to head (b7b0bce).

Files	Patch %	Lines
lib/src/core/point.dart	72.72%	6 Missing ⚠️
lib/src/core/mat.dart	50.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #222      +/-   ##
==========================================
- Coverage   91.20%   91.15%   -0.05%     
==========================================
  Files          57       57              
  Lines        8456     8480      +24     
==========================================
+ Hits         7712     7730      +18     
- Misses        744      750       +6     

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