Do not load application stack of plugins in order to enable/disable

[benjaoming]

Summary

This is a proof of concept for #186 - a concept that I suggested and reject, therefore also closing the PR immediately. It's just to illustrate.

[codecov-io]

Codecov Report

Merging #1563 into develop will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #1563      +/-   ##
===========================================
+ Coverage    73.12%   73.14%   +0.02%     
===========================================
  Files          144      144              
  Lines         4759     4763       +4     
  Branches       517      517              
===========================================
+ Hits          3480     3484       +4     
  Misses        1215     1215              
  Partials        64       64

Impacted Files	Coverage Δ
kolibri/utils/cli.py	31.25% <ø> (-0.54%)	⬇️
kolibri/plugins/learn/kolibri_plugin.py	100% <100%> (ø)	⬆️
kolibri/plugins/coach/kolibri_plugin.py	100% <100%> (ø)	⬆️
kolibri/plugins/user/kolibri_plugin.py	100% <100%> (ø)	⬆️
kolibri/plugins/management/kolibri_plugin.py	100% <100%> (ø)	⬆️
kolibri/plugins/setup_wizard/kolibri_plugin.py	100% <100%> (ø)	⬆️

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