Fix mouseover display of read name to alignments track

[cmdcolin]

Fixes #2996

Customizes the onMouseOver renderProp for the pileup display model to fetch the moused over feature from the remote (similar to a click) and then runs the mouseover callback on it

This could be considered possibly a slow step as it may run many rpc calls quickly while doing this, but in testing it out, it seemed quite fast

[cmdcolin]

potentially we could add additional mouseover information about the position of the read you are hovering over, but may be an add-on

[codecov]

Codecov Report

Merging #3021 (5b15898) into main (ba0975e) will increase coverage by 0.04%.
The diff coverage is 91.37%.

@@            Coverage Diff             @@
##             main    #3021      +/-   ##
==========================================
+ Coverage   61.20%   61.25%   +0.04%     
==========================================
  Files         586      587       +1     
  Lines       26663    26683      +20     
  Branches     6466     6470       +4     
==========================================
+ Hits        16319    16344      +25     
+ Misses      10037    10031       -6     
- Partials      307      308       +1     

Impacted Files	Coverage Δ
...lugins/alignments/src/LinearPileupDisplay/model.ts	66.52% <85.18%> (+1.54%)	⬆️
...-view/src/BaseLinearDisplay/components/Tooltip.tsx	96.29% <96.29%> (ø)
...BaseLinearDisplay/components/BaseLinearDisplay.tsx	83.72% <100.00%> (+6.90%)	⬆️
...aseLinearDisplay/models/BaseLinearDisplayModel.tsx	85.91% <100.00%> (ø)
...quenceRenderer/components/DivSequenceRendering.tsx	92.55% <0.00%> (-2.13%)	⬇️
products/jbrowse-web/src/util.ts	27.27% <0.00%> (ø)
.../linear-genome-view/src/LinearGenomeView/index.tsx	85.23% <0.00%> (+0.33%)	⬆️

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[cmdcolin]

I think this should be good to go. kind of does a fun little autorun that listens to featureIdUnderMouse, and fetches the feature data using that, so it only runs if a new feature is moused over, and it also only updates the featureUnderMouse if the feature it gets back from the async CoreGetFeature call equals the id of featureIdUnderMouse (so no stale update from the async call)