Allow using web worker RPC on embedded LGV

[cmdcolin]

This allows the user to manually configure web worker RPC for the embedded LGV. I sort of rushed as i ususally do to get this kind of wired up, but it seems to work. Can try the "deep_sequencing" track to see the difference in the storybook between the instance with webworker and without, the scroll jank much less affected on the webworker version

The web worker is not enabled by default, and is instead a manual process that the developer follows, because I do not want to make too many presumptions about the users bundler, and by making it a function (makeWorkerInstance) that they manually have to pull in to use, it would get easily tree-shaken and ignored and not cause build errors if they do not use the makeWorkerInstance function

a demo of this in the storybook actually appears to work as they use webpack 5, and looks like the below

import { createViewState, makeWorkerInstance, ... } from '@jbrowse/react-linear-genome-view'

export const WithWebWorker = () => {
  const state = createViewState({
    assembly,
    tracks,
    configuration: {
      rpc: {
        defaultDriver: 'WebWorkerRpcDriver',
      },
    },
    makeWorkerInstance,
  })
  return <JBrowseLinearGenomeView viewState={state} />
}

fixes #2942

[cmdcolin]

one way to isolate makeWorkerInstance even more would be to make it part of a separate package the user has to download to use. it is sort of convenient as is though, and also can be seen in the storybook which is kinda nice.

we could try a release with just this PR's approach, and if it causes problems, could consider externalizing into another package

[cmdcolin]

can see result here https://jbrowse.org/storybook/lgv/rpc_embedded/?path=/story/linear-view--with-web-worker

compare with loading the deep sequencing track on e.g. https://jbrowse.org/storybook/lgv/rpc_embedded/?path=/story/linear-view--one-linear-genome-view

[cmdcolin]

not sure if there is any reason to avoid just making the webworkerrpc config available, reduces the boilerplate in apps that want to use webworker rpc hence this diff

[cmdcolin]

rider change, but this looked unused, and probably better to not have it unnecessarily. pluginmanager can/should be obtained from getEnv

[codecov]

Codecov Report

Merging #3276 (231e520) into main (c234d2e) will decrease coverage by 0.13%.
The diff coverage is 11.11%.

@@            Coverage Diff             @@
##             main    #3276      +/-   ##
==========================================
- Coverage   59.52%   59.39%   -0.14%     
==========================================
  Files         676      678       +2     
  Lines       28807    28859      +52     
  Branches     7041     7041              
==========================================
- Hits        17148    17141       -7     
- Misses      11385    11444      +59     
  Partials      274      274              

Impacted Files	Coverage Δ
packages/core/rpc/configSchema.ts	66.66% <ø> (-33.34%)	⬇️
products/jbrowse-desktop/src/StartScreen/util.tsx	0.00% <ø> (ø)
.../jbrowse-react-linear-genome-view/src/rpcWorker.ts	0.00% <0.00%> (ø)
...wse-react-linear-genome-view/src/workerPolyfill.js	0.00% <0.00%> (ø)
products/jbrowse-web/src/rootModel.ts	54.73% <ø> (ø)
products/jbrowse-web/src/Loader.tsx	61.90% <50.00%> (-1.38%)	⬇️
...-linear-genome-view/src/createModel/createModel.ts	60.00% <75.00%> (-2.50%)	⬇️
...se-react-linear-genome-view/src/createViewState.ts	51.85% <100.00%> (+1.85%)	⬆️
...rative-view/src/ServerSideRenderedBlockContent.tsx	64.00% <0.00%> (-4.00%)	⬇️
... and 3 more

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[cmdcolin]

modified now so that the "ES5" build (used in nodejs and bundlers that don't use the "module" field of package.json) don't have the makeWorkerInstance and the "ESM" (most bundlers) can use makeWorkerInstance

[cmdcolin]

maybe can merge and see how it goes :)