Add simplified URL format for loading synteny views

[cmdcolin]

Example

http://localhost:3000/?config=test_data%2Fvolvox%2Fconfig.json&session=spec-{"views":[{ "type" : "LinearSyntenyView", "tracks":["volvox_fake_synteny"],"views" :[{ "loc" : "ctgA:1-100", "assembly": "volvox" },{ "loc" : "ctgA:300-400" , "assembly" : "volvox" }]}]}

prettified json

{
  views: [
    {
      type: "LinearSyntenyView",
      tracks: ["volvox_fake_synteny"],
      views: [
        { loc: "ctgA:1-100", assembly: "volvox" },
        { loc: "ctgA:300-400", assembly: "volvox" },
      ],
    },
  ],
};

[codecov]

Codecov Report

Merging #2975 (5f08550) into main (5f9692c) will decrease coverage by 0.07%.
The diff coverage is 51.21%.

@@            Coverage Diff             @@
##             main    #2975      +/-   ##
==========================================
- Coverage   60.80%   60.72%   -0.08%     
==========================================
  Files         584      585       +1     
  Lines       26574    26617      +43     
  Branches     6432     6449      +17     
==========================================
+ Hits        16157    16163       +6     
- Misses      10111    10145      +34     
- Partials      306      309       +3     

Impacted Files	Coverage Δ
...omparative-view/src/LinearComparativeView/model.ts	21.81% <ø> (ø)
products/jbrowse-web/src/SessionLoader.ts	58.62% <0.00%> (-0.26%)	⬇️
...ar-comparative-view/src/LaunchLinearSyntenyView.ts	6.66% <6.66%> (ø)
...ew/src/JBrowseCircularGenomeView/ViewContainer.tsx	65.51% <50.00%> (+3.01%)	⬆️
...kages/core/BaseFeatureWidget/BaseFeatureDetail.tsx	73.93% <70.96%> (-2.22%)	⬇️
plugins/linear-comparative-view/src/index.tsx	93.93% <100.00%> (+0.18%)	⬆️
...quenceRenderer/components/DivSequenceRendering.tsx	92.55% <0.00%> (-2.13%)	⬇️
...ckages/core/pluggableElementTypes/RpcMethodType.ts	83.33% <0.00%> (-2.09%)	⬇️
products/jbrowse-web/src/util.ts	27.27% <0.00%> (ø)

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[cmdcolin]

I think this one is probably good to go, can probably add additional spec related features as needed

[cmdcolin]

there is a chance the synteny launchview extension point could leverage the lgv launchview (it doesn't currently in this PR) but that will probably not affect things that much. can probably merge for now