Add method to more easily create compact view of alignments

[cmdcolin]

Allows more easily toggling "normal" and "compact" settings for the pileup. Previously, we only had the "Set feature height" dialog, where the user would manually enter e.g. height:1 in a text box. The "compact" setting here is equal to setting height:2 and has "Remove y-spacing between features" to true

[codecov]

Codecov Report

Merging #3384 (f879eb8) into main (fa897bf) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #3384      +/-   ##
==========================================
- Coverage   60.04%   60.03%   -0.02%     
==========================================
  Files         777      777              
  Lines       29416    29421       +5     
  Branches     7117     7117              
==========================================
  Hits        17664    17664              
- Misses      11561    11566       +5     
  Partials      191      191              

Impacted Files	Coverage Δ
...inearPileupDisplay/components/SetFeatureHeight.tsx	0.00% <0.00%> (ø)
...lugins/alignments/src/LinearPileupDisplay/model.ts	67.22% <0.00%> (-1.74%)	⬇️

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[cmdcolin]