Add dotplot session spec

[cmdcolin]

Example

http://localhost:3000/?config=test_data/volvox/config_main_thread.json&session=spec-{"views":[{"type":"DotplotView","views":[{"assembly":"volvox"},{"assembly":"volvox"}],"tracks":["volvox_fake_synteny"]}]}

Expanded

{
  views: [
    {
      type: "DotplotView",
      views: [{ assembly: "volvox" }, { assembly: "volvox" }],
      tracks: ["volvox_fake_synteny"],
    },
  ],
};

[codecov]

Codecov Report

Merging #3025 (2e52c68) into main (1d8e7e8) will increase coverage by 0.03%.
The diff coverage is 70.37%.

@@            Coverage Diff             @@
##             main    #3025      +/-   ##
==========================================
+ Coverage   61.51%   61.54%   +0.03%     
==========================================
  Files         588      589       +1     
  Lines       26804    26828      +24     
  Branches     6502     6506       +4     
==========================================
+ Hits        16489    16512      +23     
- Misses      10007    10008       +1     
  Partials      308      308              

Impacted Files	Coverage Δ
plugins/dotplot-view/src/DotplotView/model.ts	58.29% <ø> (ø)
plugins/dotplot-view/src/LaunchDotplotView.ts	65.21% <65.21%> (ø)
plugins/dotplot-view/src/index.ts	100.00% <100.00%> (ø)
...ar-comparative-view/src/LaunchLinearSyntenyView.ts	72.72% <100.00%> (ø)
...rative-view/src/ServerSideRenderedBlockContent.tsx	64.00% <0.00%> (-4.00%)	⬇️
packages/core/util/index.ts	86.31% <0.00%> (+0.23%)	⬆️
...ns/dotplot-view/src/DotplotView/components/util.ts	86.36% <0.00%> (+3.03%)	⬆️
...otplot-view/src/DotplotRenderer/DotplotRenderer.ts	79.52% <0.00%> (+3.93%)	⬆️

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[cmdcolin]

there is not yet a good navToLocString type thing on dotplot view compared with lgv, so it just loads a whole genome overview of both assemblies