Feature: Add support for user key binding customization

[timotheeguerin]

fix #2009

[codecov]

Codecov Report

Merging #2010 into master will increase coverage by 0.04%.
The diff coverage is 74.44%.

@@            Coverage Diff             @@
##           master    #2010      +/-   ##
==========================================
+ Coverage   65.42%   65.47%   +0.04%     
==========================================
  Files        1032     1035       +3     
  Lines       28288    28453     +165     
  Branches     5045     5072      +27     
==========================================
+ Hits        18508    18630     +122     
- Misses       9764     9807      +43     
  Partials       16       16

Impacted Files	Coverage Δ
.../@batch-flask/ui/keybindings/keybindings.module.ts	100% <100%> (ø)	⬆️
...nding-picker/keybinding-picker-dialog.component.ts	100% <100%> (ø)
src/@batch-flask/core/keys.ts	100% <100%> (ø)	⬆️
...e/commands/keybindings/user-keybindings.service.ts	25.64% <25.64%> (ø)
...k/core/commands/keybindings/keybindings.service.ts	78.07% <76.08%> (-0.68%)	⬇️
...atch-flask/ui/keybindings/keybindings.component.ts	91.25% <86.48%> (-4.31%)	⬇️
...k/ui/keybindings/keybindings-listener.directive.ts	95.83% <95.83%> (ø)
... and 1 more

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