feat(core): Allow get multiple values form config

[vincent4vx]

See #270

[codecov[bot]]

Codecov Report

Merging #273 (697e134) into master (e36784c) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #273      +/-   ##
============================================
+ Coverage     95.83%   95.84%   +0.01%     
- Complexity     8103     8112       +9     
============================================
  Files          1296     1296              
  Lines         20660    20671      +11     
  Branches       1205     1206       +1     
============================================
+ Hits          19800    19813      +13     
+ Misses          667      665       -2     
  Partials        193      193              

Impacted Files	Coverage Δ
...fr/quatrevieux/araknemu/core/config/EmptyPool.java	100.00% <100.00%> (ø)
...a/fr/quatrevieux/araknemu/core/config/IniPool.java	100.00% <100.00%> (ø)
...fr/quatrevieux/araknemu/core/config/PoolUtils.java	97.36% <100.00%> (+0.14%)	:arrow_up:
...ry/implementation/sql/SqlPlayerRaceRepository.java	86.84% <0.00%> (-5.27%)	:arrow_down:
...vieux/araknemu/core/dbal/SimpleConnectionPool.java	91.42% <0.00%> (+5.71%)	:arrow_up:
...lementation/sql/SqlPlayerExperienceRepository.java	86.95% <0.00%> (+8.69%)	:arrow_up:

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