Add plaintext bed support with BedAdapter

[cmdcolin]

Shares the main parsing type logic with BedTabixAdapter, but uses other plaintext type utilities like the interval tree shared with GtfAdapter

[codecov]

Codecov Report

Merging #3015 (29134a1) into main (8df7c74) will increase coverage by 0.10%.
The diff coverage is 89.80%.

@@            Coverage Diff             @@
##             main    #3015      +/-   ##
==========================================
+ Coverage   61.33%   61.43%   +0.10%     
==========================================
  Files         584      585       +1     
  Lines       26589    26688      +99     
  Branches     6439     6456      +17     
==========================================
+ Hits        16309    16397      +88     
- Misses       9973     9985      +12     
+ Partials      307      306       -1     

Impacted Files	Coverage Δ
plugins/bed/src/index.ts	82.60% <84.61%> (+0.79%)	⬆️
plugins/bed/src/BedAdapter/BedAdapter.ts	85.71% <85.71%> (ø)
plugins/gtf/src/GtfAdapter/GtfAdapter.ts	83.33% <90.90%> (-0.31%)	⬇️
plugins/bed/src/util.ts	88.31% <96.66%> (+4.31%)	⬆️
plugins/bed/src/BedTabixAdapter/BedTabixAdapter.ts	90.24% <100.00%> (+6.91%)	⬆️
plugins/gff3/src/Gff3Adapter/Gff3Adapter.ts	88.09% <100.00%> (+0.14%)	⬆️
...quenceRenderer/components/DivSequenceRendering.tsx	92.55% <0.00%> (-2.13%)	⬇️
.../linear-genome-view/src/LinearGenomeView/index.tsx	84.93% <0.00%> (-0.35%)	⬇️
products/jbrowse-web/src/util.ts	27.27% <0.00%> (ø)
packages/core/util/analytics.ts	91.83% <0.00%> (+2.04%)	⬆️

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