Add jbrowse-img to monorepo

[cmdcolin]

This is a proposal to add jbrowse-img to the monorepo. Benefits would be better testing, less likely to experience random breakage, etc.

[cmdcolin]

Maybe for now marked as draft but tests pass and should be fundamentally ok to use

Note one item is that jbrowse-img depends on jbrowse-react-linear-genome-view, so it actually needs to build jbrowse-react-linear-genome-view to run (unless we want to toggle between dist/src in package.json like plugins do)

Alternatively, we could make jbrowse-img not depend on jbrowse-react-linear-genome-view, it only uses the createViewState part

[rbuels]

sounds good to me, i think just go ahead and merge when ready

[codecov]

Codecov Report

Merging #2336 (f1f7d8c) into main (e07b309) will increase coverage by 0.40%.
The diff coverage is 52.17%.

❗ Current head f1f7d8c differs from pull request most recent head f1bfe69. Consider uploading reports for the commit f1bfe69 to get more accurate results

@@            Coverage Diff             @@
##             main    #2336      +/-   ##
==========================================
+ Coverage   61.86%   62.27%   +0.40%     
==========================================
  Files         511      516       +5     
  Lines       23414    23598     +184     
  Branches     5433     5500      +67     
==========================================
+ Hits        14486    14696     +210     
+ Misses       8660     8613      -47     
- Partials      268      289      +21     

Impacted Files	Coverage Δ
products/jbrowse-img/src/bin.js	0.00% <0.00%> (ø)
products/jbrowse-img/src/index.js	0.00% <0.00%> (ø)
products/jbrowse-img/src/renderRegion.js	61.02% <61.02%> (ø)
products/jbrowse-img/src/parseArgv.js	63.15% <63.15%> (ø)
products/jbrowse-img/src/util.js	100.00% <100.00%> (ø)
... and 13 more

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