Allow adding &tracklist=true to URL bar to open the track selector, &nav=false to hide linear genome view header

[cmdcolin]

fixes #4195

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (b6c1c22) 62.87% compared to head (ced94a1) 62.87%.

Files	Patch %	Lines
...s/linear-genome-view/src/LinearGenomeView/model.ts	33.33%	10 Missing ⚠️
...ar-genome-view/src/LaunchLinearGenomeView/index.ts	75.00%	1 Missing ⚠️
products/jbrowse-web/src/createPluginManager.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4196   +/-   ##
=======================================
  Coverage   62.87%   62.87%           
=======================================
  Files        1070     1070           
  Lines       31176    31190   +14     
  Branches     7445     7449    +4     
=======================================
+ Hits        19603    19612    +9     
- Misses      11402    11407    +5     
  Partials      171      171           

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[cmdcolin]

@scottcain what do you think about the url parameter names here?

example

https://jbrowse.org/code/jb2/tracklist_url/?config=test_data/volvox/config.json&tracklist=true&nav=false&loc=ctgA:1-1000&assembly=volvox