Fix force flag for drawing large regions and node-fetch polyfill for node 18 fix in @jbrowse/img

[cmdcolin]

Adds typescripting to @jbrowse/img

Also fixes a couple issues brought up in #3331 specifically the use of the force:true flag

Fixes #3338

[codecov]

Codecov Report

Merging #3339 (d59b2af) into main (b903476) will increase coverage by 0.00%.
The diff coverage is 2.33%.

@@           Coverage Diff           @@
##             main    #3339   +/-   ##
=======================================
  Coverage   59.19%   59.19%           
=======================================
  Files         749      749           
  Lines       29240    29236    -4     
  Branches     7083     7079    -4     
=======================================
- Hits        17308    17307    -1     
- Misses      11683    11735   +52     
+ Partials      249      194   -55     

Impacted Files	Coverage Δ
...AlignmentsDisplay/components/AlignmentsDisplay.tsx	56.25% <ø> (ø)
...nce/src/IndexedFastaAdapter/IndexedFastaAdapter.ts	84.09% <ø> (-0.70%)	⬇️
products/jbrowse-img/src/index.testmod.js	0.00% <0.00%> (ø)
products/jbrowse-img/src/index.ts	0.00% <0.00%> (ø)
products/jbrowse-img/src/parseArgv.testmod.js	0.00% <0.00%> (ø)
products/jbrowse-img/src/parseArgv.ts	0.00% <0.00%> (ø)
products/jbrowse-img/src/renderRegion.tsx	0.00% <0.00%> (ø)
products/jbrowse-img/src/util.ts	0.00% <0.00%> (ø)
...ments/src/LinearAlignmentsDisplay/models/model.tsx	66.29% <40.00%> (ø)
packages/core/util/io/index.ts	52.72% <50.00%> (+0.94%)	⬆️
... and 4 more

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[cmdcolin]

this now also is using the srcMain/distMain on the @jbrowse/react-linear-genome-view. this avoids having to use "pretest-jbimg" that builds the @jbrowse/react-linear-genome-view