#586 bitmap loader init perf fixes

[dpvreony]

What kind of change does this PR introduce?
bug fix of poor perf in platform bitmap loader init during debug

closes #586
closes #421

What is the current behavior?
mass debug lines on xamarin debugger means initialisation is slow and gives poor experience

What is the new behavior?
uses stringbuilder and parallel assembly searching.

What might this PR break?
stringbuilder might get big, debug output is now single large burst

Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[codecov]

Codecov Report

Merging #598 into main will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #598   +/-   ##
=======================================
  Coverage   67.12%   67.13%           
=======================================
  Files          85       85           
  Lines        4170     4171    +1     
  Branches      416      416           
=======================================
+ Hits         2799     2800    +1     
  Misses       1285     1285           
  Partials       86       86           

Impacted Files	Coverage Δ
...ing/Platforms/net4/Bitmaps/PlatformBitmapLoader.cs	52.00% <0.00%> (+0.97%)	⬆️

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[github-actions]

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