Optimizations and usability improvements to synteny view

[cmdcolin]

• Adds resize handle to the linear synteny view
• Adds optimization to the linear synteny view similar to what was done for dotplot: bypass using the observables and operate on snapshot
• Avoid creating a syntenytrack from import form on dotplot/synteny view if none was specified

[cmdcolin]

example screenshot

[codecov]

Codecov Report

Merging #2679 (4d09f51) into main (7a24a88) will decrease coverage by 0.01%.
The diff coverage is 23.52%.

@@            Coverage Diff             @@
##             main    #2679      +/-   ##
==========================================
- Coverage   60.73%   60.72%   -0.02%     
==========================================
  Files         561      561              
  Lines       26270    26279       +9     
  Branches     6394     6397       +3     
==========================================
+ Hits        15955    15957       +2     
- Misses       9988     9995       +7     
  Partials      327      327              

Impacted Files	Coverage Δ
packages/core/util/index.ts	85.38% <ø> (ø)
...arative-view/src/LinearComparativeDisplay/index.ts	5.88% <ø> (ø)
...ew/src/LinearComparativeView/components/Header.tsx	0.00% <0.00%> (ø)
...mparativeView/components/LinearComparativeView.tsx	0.00% <0.00%> (ø)
...omparative-view/src/LinearComparativeView/model.ts	7.14% <0.00%> (-0.39%)	⬇️
...comparative-view/src/LinearSyntenyDisplay/index.ts	28.57% <ø> (+3.57%)	⬆️
...tenyRenderer/components/LinearSyntenyRendering.tsx	1.35% <0.00%> (-0.02%)	⬇️
...ew/src/LinearSyntenyView/components/ImportForm.tsx	0.00% <0.00%> (ø)
plugins/linear-comparative-view/src/util.ts	1.88% <0.00%> (ø)
...lot-view/src/DotplotView/components/ImportForm.tsx	83.33% <85.71%> (+0.47%)	⬆️
... and 1 more

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