Add "emphasis" mode for no fill/scatterplot mode in XYPlot type renderings

[cmdcolin]

Currently we have the "no fill" mode on XYPlotRenderer type tracks

This helps draw a scatterplot style rendering

It can be useful to emphasize those scatterplot points, so this PR adds an "emphasis" setting that is toggleable

current main: all the no-fill points are quite tiny

this branch: emphasis mode makes points 2px in size

[codecov]

Codecov Report

Merging #3106 (50dc97e) into main (a744a1e) will decrease coverage by 0.02%.
The diff coverage is 28.81%.

❗ Current head 50dc97e differs from pull request most recent head 1e24174. Consider uploading reports for the commit 1e24174 to get more accurate results

@@            Coverage Diff             @@
##             main    #3106      +/-   ##
==========================================
- Coverage   58.92%   58.90%   -0.03%     
==========================================
  Files         640      640              
  Lines       28807    28837      +30     
  Branches     6985     6993       +8     
==========================================
+ Hits        16974    16985      +11     
- Misses      11450    11470      +20     
+ Partials      383      382       -1     

Impacted Files	Coverage Δ
...ugins/wiggle/src/MultiLineRenderer/configSchema.ts	100.00% <ø> (ø)
...ggle/src/MultiLinearWiggleDisplay/models/model.tsx	2.11% <0.00%> (-0.11%)	⬇️
...ns/wiggle/src/MultiRowLineRenderer/configSchema.ts	100.00% <ø> (ø)
.../wiggle/src/MultiRowXYPlotRenderer/configSchema.ts	100.00% <ø> (ø)
...ins/wiggle/src/MultiXYPlotRenderer/configSchema.ts	100.00% <ø> (ø)
plugins/wiggle/src/XYPlotRenderer/configSchema.ts	100.00% <ø> (ø)
...ns/wiggle/src/LinearWiggleDisplay/models/model.tsx	70.72% <34.78%> (-1.40%)	⬇️
...c/LinearGenomeView/components/LinearGenomeView.tsx	88.88% <50.00%> (+2.68%)	⬆️
plugins/wiggle/src/drawxy.ts	71.10% <88.88%> (+0.67%)	⬆️
plugins/alignments/src/BamAdapter/BamAdapter.ts	72.07% <0.00%> (-0.91%)	⬇️
... and 4 more

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