CNAM-432: Refactoring in drugs and followup test classes, not used m…

[Anfor]

…ethods removed and finish implementation in DrugExtractor

[Anfor]

I create this branch to avoid problem merging

[codecov[bot]]

Codecov Report

Merging #230 into develop will increase coverage by 0.94%. The diff coverage is 92.3%.

@@             Coverage Diff             @@
##           develop     #230      +/-   ##
===========================================
+ Coverage     92.9%   93.84%   +0.94%     
===========================================
  Files          183      183              
  Lines         2282     2242      -40     
  Branches        62       62              
===========================================
- Hits          2120     2104      -16     
+ Misses         162      138      -24

Impacted Files	Coverage Δ
...que/cmap/cnam/etl/extractors/dcir/DcirSource.scala	95.45% <ø> (ø)	:arrow_up:
.../polytechnique/cmap/cnam/etl/events/FollowUp.scala	100% <ø> (ø)	:arrow_up:
...cmap/cnam/etl/transformers/follow_up/Columns.scala	53.33% <ø> (-2.92%)	:arrow_down:
...ers/observation/ObservationPeriodTransformer.scala	100% <ø> (ø)	:arrow_up:
...nique/cmap/cnam/etl/events/ObservationPeriod.scala	100% <ø> (+66.66%)	:arrow_up:
...ap/cnam/etl/transformers/observation/Columns.scala	53.33% <ø> (ø)	:arrow_up:
...l/transformers/follow_up/FollowUpTransformer.scala	100% <100%> (ø)	:arrow_up:
...cmap/cnam/etl/extractors/drugs/DrugExtractor.scala	100% <100%> (ø)	:arrow_up:
.../cmap/cnam/etl/extractors/dcir/DcirExtractor.scala	100% <100%> (ø)	:arrow_up:
...a/fr/polytechnique/cmap/cnam/etl/events/Drug.scala	100% <100%> (ø)	:arrow_up:
... and 4 more

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