Display subfeatures in feature details widget

[cmdcolin]

Alternative to #1317

[cmdcolin]

The aims of this include

0. Include a bit of refactoring that was done in mygene.info adapter and data table in the feature details widgets #1503
1. Render subfeature details from Add subfeature details to the feature details widget #1317
2. Avoid the issue of Add subfeature details to the feature details widget #1317 where all subfeatures are in a list, and instead allow nested subfeatures
3. Always render one level of subfeatures, and make the rest in a defaultExpanded=false accordion

[cmdcolin]

I was not seeing the performance hit from viewing a long read that was seen previously, so this was removed

[cmdcolin]

Screenshot

[codecov]

Codecov Report

Merging #1529 (d0738a3) into master (221c8ba) will decrease coverage by 0.01%.
The diff coverage is 71.69%.

@@            Coverage Diff             @@
##           master    #1529      +/-   ##
==========================================
- Coverage   59.52%   59.50%   -0.02%     
==========================================
  Files         435      435              
  Lines       19501    19526      +25     
  Branches     4540     4551      +11     
==========================================
+ Hits        11607    11619      +12     
- Misses       7599     7611      +12     
- Partials      295      296       +1     

Impacted Files	Coverage Δ
...kages/core/BaseFeatureWidget/BaseFeatureDetail.tsx	82.75% <71.69%> (-14.02%)	⬇️

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