Add get_values_for_keys function to utils

[FernandoKGA]

Closes #344.

[FernandoKGA]

@camilonova and @Mogost , could you guys take a look? In my opinion it solves the issue, not inside the Config as mentioned, but definitely a use case that I would particularly appreciate to reduce database access.

[Natim]

The PR looks good to me, both comments are just nits

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.67%. Comparing base (1451943) to head (52979b2).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #607      +/-   ##
==========================================
+ Coverage   84.23%   84.67%   +0.43%     
==========================================
  Files          21       21              
  Lines         736      744       +8     
  Branches      117      121       +4     
==========================================
+ Hits          620      630      +10     
+ Misses         83       82       -1     
+ Partials       33       32       -1     

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