Preload designs

[albireox]

Allows to preload a design and leave it ready to be made active in short notice.

[codecov]

Codecov Report

Merging #180 (6629ee2) into main (94b07b8) will decrease coverage by 0.2%.
The diff coverage is 14.8%.

@@           Coverage Diff           @@
##            main    #180     +/-   ##
=======================================
- Coverage   47.3%   47.1%   -0.1%     
=======================================
  Files         41      41             
  Lines       5814    5866     +52     
  Branches    1129    1141     +12     
=======================================
+ Hits        2746    2759     +13     
- Misses      2792    2831     +39     
  Partials     276     276             

Impacted Files	Coverage Δ
python/jaeger/actor/commands/configuration.py	19.6% <12.7%> (+0.7%)	⬆️
python/jaeger/utils/database.py	23.6% <25.0%> (-0.5%)	⬇️
python/jaeger/target/configuration.py	27.0% <33.4%> (+0.1%)	⬆️
python/jaeger/fps.py	70.0% <100.0%> (+0.1%)	⬆️

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