Add dialog for launching breakpoint split view from variant feature details

[cmdcolin]

This is a demo for launching a breakpoint split view from a variant feature details panel

Note that there could be a similar thing dialog needed for alignments

An add on to this exists for side-by-side breakpoint split view but that may need more work (see branch side_by_side_dialog)

[codecov]

Codecov Report

Merging #1831 (b67c884) into master (e2594e3) will decrease coverage by 0.07%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##           master    #1831      +/-   ##
==========================================
- Coverage   58.85%   58.77%   -0.08%     
==========================================
  Files         459      460       +1     
  Lines       21389    21421      +32     
  Branches     5051     5060       +9     
==========================================
+ Hits        12589    12591       +2     
- Misses       8489     8519      +30     
  Partials      311      311              

Impacted Files	Coverage Δ
.../src/VariantFeatureWidget/VariantFeatureWidget.tsx	44.00% <0.00%> (-1.21%)	⬇️
.../src/VariantFeatureWidget/BreakendOptionDialog.tsx	3.44% <3.44%> (ø)
plugins/breakpoint-split-view/src/model.ts	43.93% <100.00%> (+0.42%)	⬆️

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