support small, medium and large SFSymbols

[swhitty]

Currently SwiftDraw generates SFSymbols in the small size category. This PR allows users to generate symbols in either small, medium or large;

% swiftdraw arrow-circle.svg --format sfsymbol --size medium

Available keys for --format sfsymbol:
 --insets             alignment of regular variant: top,left,bottom,right | auto
 --size               size category to generate: small, medium large. (default is small)
 --ultralight         svg file of ultralight variant
 --ultralight-insets  alignment of ultralight variant: top,left,bottom,right | auto
 --black              svg file of black variant
 --black-insets       alignment of black variant: top,left,bottom,right | auto
 --legacy             use the original, less precise alignment logic from earlier swiftdraw versions.

[codecov]

Codecov Report

❌ Patch coverage is 73.40426% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.68%. Comparing base (a535740) to head (9d4804c).

Files with missing lines	Patch %	Lines
...ources/CommandLine/CommandLine.Configuration.swift	48.00%	13 Missing ⚠️
SwiftDraw/Sources/Renderer/Renderer.SFSymbol.swift	90.00%	6 Missing ⚠️
...wiftDraw/Sources/Formatter/XML.Formatter.SVG.swift	16.66%	5 Missing ⚠️
...Draw/Sources/CommandLine/CommandLine+Process.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #92   +/-   ##
=======================================
  Coverage   89.67%   89.68%           
=======================================
  Files         144      144           
  Lines       12206    12291   +85     
=======================================
+ Hits        10946    11023   +77     
- Misses       1260     1268    +8     

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