Feature: Resizable left pane

[timotheeguerin]

fix #1544

[codecov]

Codecov Report

Merging #1788 into master will decrease coverage by <.01%.
The diff coverage is 30.76%.

@@            Coverage Diff             @@
##           master    #1788      +/-   ##
==========================================
- Coverage   59.49%   59.48%   -0.01%     
==========================================
  Files         947      947              
  Lines       25708    25716       +8     
  Branches     4696     4698       +2     
==========================================
+ Hits        15295    15298       +3     
- Misses      10381    10386       +5     
  Partials       32       32

Impacted Files	Coverage Δ
...tch-flask/ui/browse-layout/browse-layout.module.ts	100% <ø> (ø)	⬆️
...-pane/split-separator/split-separator.component.ts	76.92% <100%> (+4.19%)	⬆️
...-flask/ui/browse-layout/browse-layout.component.ts	13.33% <14.28%> (+0.2%)	⬆️
...rc/@batch-flask/ui/file/file-loader/file-loader.ts	69.11% <25%> (ø)	⬆️

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