Determine minX/minY/maxX/maxY by iterating over points/paths only onc…

[remcoros]

…e instead of using Linq

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• I have provided test coverage for my change (where applicable)

Description

While investigating another (solved) issue, I saw this pattern of using Linq to get the minX/minY/length/etc. This iterates over the list multiple times and could be optimized by iterating only once and keeping track of min/max values.

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[codecov]

Codecov Report

Merging #240 (0bc8b36) into main (4149a1b) will increase coverage by 0%.
The diff coverage is 100%.

@@         Coverage Diff         @@
##           main   #240   +/-   ##
===================================
  Coverage    71%    71%           
===================================
  Files        88     88           
  Lines      5362   5370    +8     
  Branches   1096   1098    +2     
===================================
+ Hits       3845   3853    +8     
  Misses     1298   1298           
  Partials    219    219           

Flag	Coverage Δ
unittests	71% <100%> (+<1%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/ImageSharp.Drawing/Shapes/InternalPath.cs	88% <100%> (+<1%)	⬆️
src/ImageSharp.Drawing/Shapes/PathCollection.cs	59% <100%> (+6%)	⬆️

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[JimBobSquarePants]

Looks great. Thanks!