Feature: Show file group upload progress

[timotheeguerin]

fix #775

[codecov]

Codecov Report

Merging #1901 into master will increase coverage by <.01%.
The diff coverage is 57.89%.

@@            Coverage Diff             @@
##           master    #1901      +/-   ##
==========================================
+ Coverage   64.15%   64.16%   +<.01%     
==========================================
  Files        1006     1006              
  Lines       27566    27591      +25     
  Branches     5039     5043       +4     
==========================================
+ Hits        17686    17703      +17     
- Misses       9842     9850       +8     
  Partials       38       38

Impacted Files	Coverage Δ
...ata/action/add/file-group-create-form.component.ts	10.89% <0%> (-0.34%)	⬇️
...d/file-group-picker/file-group-picker.component.ts	74.35% <78.57%> (+1.14%)	⬆️

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