Add click and drag to gene glyphs

[shashankbrgowda]

Fixes #263
Fixes #297

[codecov]

Codecov Report

Merging #269 (0f58fb9) into main (47dca9f) will decrease coverage by 0.86%.
Report is 3 commits behind head on main.
The diff coverage is 0.00%.

❗ Current head 0f58fb9 differs from pull request most recent head e1132a9. Consider uploading reports for the commit e1132a9 to get more accurate results

@@           Coverage Diff            @@
##            main    #269      +/-   ##
========================================
- Coverage   8.53%   7.68%   -0.86%     
========================================
  Files         85      85              
  Lines       5012    5571     +559     
  Branches    1170    1410     +240     
========================================
  Hits         428     428              
- Misses      4212    4691     +479     
- Partials     372     452      +80     

Files Changed	Coverage Δ
...-apollo/src/LinearApolloDisplay/glyphs/BoxGlyph.ts	0.00% <0.00%> (ø)
...c/LinearApolloDisplay/glyphs/CanonicalGeneGlyph.ts	0.00% <0.00%> (ø)
...rc/LinearApolloDisplay/glyphs/GenericChildGlyph.ts	0.00% <0.00%> (ø)
...gin-apollo/src/LinearApolloDisplay/glyphs/Glyph.ts	0.00% <0.00%> (ø)
...inearApolloDisplay/glyphs/ImplicitExonGeneGlyph.ts	0.00% <0.00%> (ø)
.../src/LinearApolloDisplay/stateModel/mouseEvents.ts	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[garrettjstevens]

I added a few more things to this branch that had to do with changing feature locations. If a feature has multiple locations, they show up in the grid now: