Allow hiding subfeatures in the feature details panel

[cmdcolin]

from question asked here #4084

the current feature detail formatter was not able to handle this (can't set e.g. formatDetails->subfeatures to undefined because it is maintained in a separate __jbrowsefmt object that isnt iterated over)

[cmdcolin]

another option I considered was detecting that subfeatures:undefined was set on the __jbrowsefmt object (by detecting 'subfeatures' in __jbrowsefmt && !__jbrowsefmt.subfeatures) but not sure that this is necessarily more clear

possible con to this approach: this hides all subfeatures, and not just those at a certain depth

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (05e1776) 63.24% compared to head (3ea0f52) 63.24%.

Files	Patch %	Lines
packages/core/BaseFeatureWidget/index.ts	60.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4091   +/-   ##
=======================================
  Coverage   63.24%   63.24%           
=======================================
  Files        1045     1045           
  Lines       30616    30618    +2     
  Branches     7314     7315    +1     
=======================================
+ Hits        19362    19365    +3     
  Misses      11084    11084           
+ Partials      170      169    -1     

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[cmdcolin]

removed the hideSubfeatures concept, instead changed to use

formatDetails:{
 maxDepth:0
}

this is more general in allowing different levels to be hidden