feat: show folder sizes in file tree

[jstucke]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.65%. Comparing base (ec75077) to head (0f47e6e). Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1370   +/-   ##
=======================================
  Coverage   91.65%   91.65%           
=======================================
  Files         374      374           
  Lines       21050    21054    +4     
=======================================
+ Hits        19294    19298    +4     
  Misses       1756     1756           

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