Save user settings from LGV

[cmdcolin]

Saves the "show center line", "track labels", and "show cytobands" settings in localStorage

Note: This requires adding a "polyfill" for doing localstorage on the worker, because the model types for e.g. lgv are created on the worker. The LGV definitely doesn't need to exist in the worker bundle but it does

Fixes #2530

[codecov]

Codecov Report

Merging #2677 (db008cf) into main (7a24a88) will increase coverage by 0.01%.
The diff coverage is 81.81%.

❗ Current head db008cf differs from pull request most recent head 9cd6815. Consider uploading reports for the commit 9cd6815 to get more accurate results

@@            Coverage Diff             @@
##             main    #2677      +/-   ##
==========================================
+ Coverage   60.73%   60.74%   +0.01%     
==========================================
  Files         561      561              
  Lines       26270    26280      +10     
  Branches     6394     6397       +3     
==========================================
+ Hits        15955    15964       +9     
- Misses       9988     9989       +1     
  Partials      327      327              

Impacted Files	Coverage Δ
products/jbrowse-web/src/workerPolyfill.js	13.33% <ø> (ø)
.../linear-genome-view/src/LinearGenomeView/index.tsx	83.84% <80.00%> (-0.07%)	⬇️
packages/core/rpc/BaseRpcDriver.ts	84.76% <100.00%> (ø)
...ckages/core/pluggableElementTypes/RpcMethodType.ts	85.41% <0.00%> (+2.08%)	⬆️

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[cmdcolin]

no longer need polyfill because it evaluates the localstorage in a types.optional callback initializer, which is better anyways because it allows the saved setting to be used in a single session rather than across sessions