Add about dialog with version number for embedded components

[cmdcolin]

This writes a version.js file to the embedded components "postversion" in the build cycle, and allows the component to access the version number while running

Clicking on the "Logo" in the top right of the viewcontainer then pops up a small about dialog

[cmdcolin]

ex screenshot

[codecov]

Codecov Report

Merging #3162 (a858a23) into main (a18afa8) will decrease coverage by 0.03%.
The diff coverage is 48.14%.

❗ Current head a858a23 differs from pull request most recent head f51a006. Consider uploading reports for the commit f51a006 to get more accurate results

@@            Coverage Diff             @@
##             main    #3162      +/-   ##
==========================================
- Coverage   58.72%   58.68%   -0.04%     
==========================================
  Files         668      672       +4     
  Lines       29139    29161      +22     
  Branches     7088     7091       +3     
==========================================
+ Hits        17111    17113       +2     
- Misses      11650    11669      +19     
- Partials      378      379       +1     

Impacted Files	Coverage Δ
...-genome-view/src/createModel/createSessionModel.ts	10.13% <0.00%> (ø)
...e-view/src/JBrowseLinearGenomeView/AboutDialog.tsx	0.00% <0.00%> (ø)
...-genome-view/src/createModel/createSessionModel.ts	18.00% <0.00%> (ø)
...ew/src/JBrowseCircularGenomeView/ViewContainer.tsx	63.63% <50.00%> (-1.89%)	⬇️
...view/src/JBrowseLinearGenomeView/ViewContainer.tsx	61.11% <55.55%> (-5.56%)	⬇️
...view/src/JBrowseCircularGenomeView/AboutDialog.tsx	80.00% <80.00%> (ø)
.../jbrowse-react-circular-genome-view/src/version.js	100.00% <100.00%> (ø)
...ts/jbrowse-react-linear-genome-view/src/version.js	100.00% <100.00%> (ø)
...svg/src/SvgFeatureRenderer/components/Segments.tsx	85.71% <0.00%> (-7.15%)	⬇️
...src/SvgFeatureRenderer/components/FeatureLabel.tsx	80.55% <0.00%> (-5.56%)	⬇️
... and 6 more

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[cmdcolin]

any thoughts on this? could potentially allow it to be user customizable too perhaps

[cmdcolin]

I changed the code a little so that it only runs the bundler (generating the UMD bundles) in the postversion step, so the right version gets bundled then (if it is bundled in the build step, the predecessor version will get bundled since version is made after build)