Add mouseovers in feature details that show field descriptions for VCF fields

[cmdcolin]

This adds the ability to inspect the "description" of a particular INFO field entry from a VCF

Modifies the API for BaseFeatureDetails somewhat to use this

Adds an API called getMetadata to the rpcManager, CoreGetMetadata, to get parsed adapter headers that may contain this information

[cmdcolin]

This has the possible benefit of being loaded into the feature detail panel at "click-time" so it can survive refresh, but doesn't have to bloat feature objects with info

[codecov]

Codecov Report

Merging #1853 (a74b92f) into main (11722a2) will increase coverage by 0.06%.
The diff coverage is 97.22%.

@@            Coverage Diff             @@
##             main    #1853      +/-   ##
==========================================
+ Coverage   59.13%   59.20%   +0.06%     
==========================================
  Files         460      460              
  Lines       21414    21436      +22     
  Branches     5023     5028       +5     
==========================================
+ Hits        12664    12692      +28     
+ Misses       8443     8438       -5     
+ Partials      307      306       -1     

Impacted Files	Coverage Δ
plugins/variants/src/VariantFeatureWidget/index.js	75.00% <ø> (ø)
packages/core/rpc/coreRpcMethods.ts	86.48% <87.50%> (+0.12%)	⬆️
...kages/core/BaseFeatureWidget/BaseFeatureDetail.tsx	79.54% <100.00%> (+2.93%)	⬆️
...gnments/src/CramAdapter/CramSlightlyLazyFeature.ts	85.93% <100.00%> (+0.14%)	⬆️
...ns/alignments/src/PileupRenderer/PileupRenderer.ts	65.65% <100.00%> (-0.23%)	⬇️
plugins/variants/src/LinearVariantDisplay/model.ts	100.00% <100.00%> (ø)
.../src/VariantFeatureWidget/VariantFeatureWidget.tsx	40.78% <100.00%> (+0.78%)	⬆️
...inearGenomeView/components/RefNameAutocomplete.tsx	93.61% <0.00%> (+4.25%)	⬆️
...ns/variants/src/VcfTabixAdapter/VcfTabixAdapter.ts	93.44% <0.00%> (+4.91%)	⬆️

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