Add aborting to CoreGetFeatures rpcManager call

[cmdcolin]

This PR that adds an AbortSignal options parameter to "CoreGetFeatures" rpcManager

This was just based on the observation that "SequenceDialog" if a large region is selected and then the dialog is closed, does not cancel the fetch of sequence

This does not yet actually add full aborting for that sequence fetch, because the sequence adapters such as indexedfasta-js et al would have to add abort support to make this really work, but it may be worth it to have the infrastructure added here anyways

[codecov]

Codecov Report

Merging #1874 (e292d98) into main (b5cb5ab) will increase coverage by 0.00%.
The diff coverage is 54.54%.

@@           Coverage Diff           @@
##             main    #1874   +/-   ##
=======================================
  Coverage   62.56%   62.56%           
=======================================
  Files         484      484           
  Lines       22707    22711    +4     
  Branches     5152     5153    +1     
=======================================
+ Hits        14206    14210    +4     
  Misses       8231     8231           
  Partials      270      270           

Impacted Files	Coverage Δ
...src/LinearGenomeView/components/SequenceDialog.tsx	55.69% <46.15%> (+5.02%)	⬆️
...nce/src/IndexedFastaAdapter/IndexedFastaAdapter.ts	75.67% <50.00%> (+0.67%)	⬆️
packages/core/rpc/coreRpcMethods.ts	78.40% <85.71%> (-0.25%)	⬇️
...equence/src/BgzipFastaAdapter/BgzipFastaAdapter.ts	76.92% <100.00%> (ø)
packages/core/util/io/rangeFetcher.ts	90.24% <0.00%> (-2.44%)	⬇️
packages/core/assemblyManager/assemblyManager.ts	60.00% <0.00%> (-1.43%)	⬇️

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[cmdcolin]

@garrettjstevens any opinion on the opts parameter being explicitly separate? IIRC this is not how some of our other RPC work, and instead the entire args gets passed in as opts

[garrettjstevens]

@cmdcolin Good point, now that I think about it, signal should be directly in args and not args.opts since RpcMethodType.deserializeArguments(args) does some work to deserialize args.signal.

[cmdcolin]

Tried adding GMOD/indexedfasta-js#57 but it did not yet achieve aborting when closing the dialog. Aborting is hard as usual

[cmdcolin]

note that this PR did not achieve actually performing an abort on closing the dialog, but just as a step in the right direction, just went ahead with merge :)