Allow configuring default display height

[cmdcolin]

Fixes #3030

Makes "height" into a getter on track displays, and uses a preProcessSnapshot to put any existing snapshots e.g. from session shares, into a state model attribute called heightPreConfig

[codecov]

Codecov Report

Merging #3510 (71cf35c) into main (580f0e3) will increase coverage by 0.02%.
The diff coverage is 78.94%.

@@            Coverage Diff             @@
##             main    #3510      +/-   ##
==========================================
+ Coverage   61.11%   61.14%   +0.02%     
==========================================
  Files         833      833              
  Lines       29702    29716      +14     
  Branches     7091     7095       +4     
==========================================
+ Hits        18153    18169      +16     
+ Misses      11387    11385       -2     
  Partials      162      162              

Impacted Files	Coverage Δ
...src/LinearAlignmentsDisplay/models/configSchema.ts	100.00% <ø> (ø)
...-view/src/BaseLinearDisplay/models/configSchema.ts	50.00% <ø> (ø)
...ments/src/LinearAlignmentsDisplay/models/model.tsx	80.17% <70.00%> (+0.54%)	⬆️
...aseLinearDisplay/models/BaseLinearDisplayModel.tsx	86.98% <88.88%> (+0.27%)	⬆️
packages/core/ui/ResizeBar.tsx	77.41% <0.00%> (+9.67%)	⬆️

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[cmdcolin]

seems pretty straightforward, probably can merge