Create in app graphical plugin store

[elliothershberg]

This is currently a draft PR while I get a few things figured out, but works for web. Opening this so I have a better view of the diff on this branch and the state of the CI.

Remaining work:

• Get things working in desktop
• Write tests 😅
• Merge main and resolve conflicts

This closes #336 and also closes #1686 .

Screenshots:

With MsaView open:

[codecov]

Codecov Report

Merging #1931 (a3cf8e8) into main (8951f54) will increase coverage by 0.11%.
The diff coverage is 57.27%.

@@            Coverage Diff             @@
##             main    #1931      +/-   ##
==========================================
+ Coverage   59.99%   60.11%   +0.11%     
==========================================
  Files         459      467       +8     
  Lines       21698    21889     +191     
  Branches     5080     5103      +23     
==========================================
+ Hits        13018    13158     +140     
- Misses       8380     8429      +49     
- Partials      300      302       +2     

Impacted Files	Coverage Δ
packages/core/ui/FileSelector.tsx	68.62% <ø> (-0.61%)	⬇️
packages/core/ui/RecentSessionCard.js	14.28% <ø> (ø)
products/jbrowse-desktop/src/Loader.tsx	0.00% <0.00%> (ø)
products/jbrowse-desktop/src/jbrowseModel.js	15.49% <0.00%> (-2.25%)	⬇️
products/jbrowse-desktop/src/rootModel.ts	36.11% <0.00%> (-1.39%)	⬇️
products/jbrowse-web/src/AdminComponent.tsx	0.00% <0.00%> (ø)
products/jbrowse-web/src/Loader.tsx	55.63% <0.00%> (-3.44%)	⬇️
products/jbrowse-desktop/src/JBrowse.js	55.17% <16.66%> (-3.01%)	⬇️
products/jbrowse-web/src/sessionModelFactory.ts	60.18% <38.46%> (-0.93%)	⬇️
plugins/data-management/src/index.ts	73.68% <42.85%> (-6.97%)	⬇️
... and 26 more

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[cmdcolin]

random note but we could, once we do something like this PR, avoid popping up warning dialogs for external configs on other domains. this is helpful for example in our plugins where we demonstrate them by linking them link https://s3.amazonaws.com/jbrowse.org/code/jb2/main/index.html?config=<cross domain here>

probably the warning popup could be avoided if the plugin is whitelisted aka found in the plugins.json

[elliothershberg]

Yeah, I think that would be good to do

[rbuels]

this looks great! few little nits to pick:

• can we get some screen shots in here? This feature will be released with some fanfare, and we will want some nice screen shots
• can we make this widget lazy-loaded? this will probably be used relatively infrequently by end users

[rbuels]

I say merge once the above is done

[elliothershberg]

I say merge once the above is done

On it!