Typescript the QuickLRU module in @jbrowse/core

[cmdcolin]

This copies quick-lru code directly into our codebase so that we can use the latest version, with it's .d.ts typescript definitions

Then it applies a couple typescripting changes throughout the code to make this work (refactor indexedfasta, assemblymanager)

[codecov]

Codecov Report

Merging #3164 (75f61e1) into main (d487b58) will increase coverage by 0.77%.
The diff coverage is 92.10%.

@@            Coverage Diff             @@
##             main    #3164      +/-   ##
==========================================
+ Coverage   58.68%   59.46%   +0.77%     
==========================================
  Files         668      667       -1     
  Lines       29139    28606     -533     
  Branches     7088     6923     -165     
==========================================
- Hits        17101    17010      -91     
+ Misses      11660    11275     -385     
+ Partials      378      321      -57     

Impacted Files	Coverage Δ
packages/core/rpc/coreRpcMethods.ts	80.45% <ø> (ø)
packages/core/util/index.ts	84.41% <ø> (+0.23%)	⬆️
plugins/alignments/src/PileupRPC/rpcMethods.ts	51.21% <ø> (ø)
plugins/wiggle/src/WiggleRPC/rpcMethods.ts	36.36% <ø> (ø)
...nce/src/IndexedFastaAdapter/IndexedFastaAdapter.ts	84.78% <80.76%> (+3.38%)	⬆️
packages/core/TextSearch/TextSearchManager.ts	97.05% <96.00%> (+5.16%)	⬆️
packages/core/assemblyManager/assembly.ts	92.25% <100.00%> (ø)
plugins/dotplot-view/src/extensionPoints.ts	100.00% <100.00%> (ø)
plugins/dotplot-view/src/index.ts	100.00% <100.00%> (ø)
...equence/src/BgzipFastaAdapter/BgzipFastaAdapter.ts	100.00% <100.00%> (+23.07%)	⬆️
... and 5 more

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