PileupRenderer refactor

[cmdcolin]

This "modularizes" the PileupRenderer into a variety of separate files to help control the sprawling nature of the single PileupRenderer class.

The 'coloring' methods were not actually accessing any of the class state so this PR proposes modularizing them into accessory files.

An alternative approach to this could be making a 'glyph' classes. It's tricky because there are a couple 'layers' for drawing a pileup glyph

1. choosing color, affected by color by
2. rendering the glyph in that color
3. rendering the 'markup' to render over the glyph (which can be mismatches, modifications, per-base quality scores, or per-base lettering)

the 'functional' style of these helper functions is i think not a bad system and may even be better than object oriented style glyph code

Note: the functional style also can lend itself to lazy loading, this isn't done in this PR but could be added later too

[codecov]

Codecov Report

Merging #3734 (5ad5aa5) into main (527b08e) will increase coverage by 0.01%.
The diff coverage is 61.09%.

@@            Coverage Diff             @@
##             main    #3734      +/-   ##
==========================================
+ Coverage   64.37%   64.39%   +0.01%     
==========================================
  Files         962      977      +15     
  Lines       29958    29932      -26     
  Branches     7185     7176       -9     
==========================================
- Hits        19286    19275      -11     
+ Misses      10506    10491      -15     
  Partials      166      166              

Impacted Files	Coverage Δ
packages/app-core/src/ui/App/ViewMenu.tsx	83.33% <ø> (ø)
...ignments/src/PileupRenderer/renderModifications.ts	0.00% <0.00%> (ø)
...ments/src/PileupRenderer/renderPerBaseLettering.ts	0.00% <0.00%> (ø)
...gnments/src/PileupRenderer/renderPerBaseQuality.ts	0.00% <0.00%> (ø)
plugins/alignments/src/PileupRenderer/colorBy.ts	5.40% <5.40%> (ø)
...ments/src/PileupRenderer/getAlignmentShapeColor.ts	39.02% <39.02%> (ø)
...s/alignments/src/PileupRenderer/renderAlignment.ts	55.00% <55.00%> (ø)
...w/src/LinearGenomeView/components/MiniControls.tsx	83.33% <80.00%> (+27.08%)	⬆️
.../alignments/src/PileupRenderer/renderMismatches.ts	80.64% <80.64%> (ø)
...alignments/src/PileupRenderer/renderMethylation.ts	83.78% <83.78%> (ø)
... and 10 more

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