conversion of User SignupStage from map to array for the frontend

[canemacchina]

No description provided.

[codecov]

Codecov Report

Merging #33 into master will decrease coverage by 0.89%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master      #33     +/-   ##
=========================================
- Coverage   80.07%   79.18%   -0.9%     
=========================================
  Files          56       56             
  Lines         798      807      +9     
  Branches       84       85      +1     
=========================================
  Hits          639      639             
- Misses        150      159      +9     
  Partials        9        9

Impacted Files	Coverage Δ
...ava/io/growingabit/app/model/base/SignupStage.java	92.85% <ø> (ø)	⬆️
...d/src/main/java/io/growingabit/app/model/User.java	79.54% <0%> (-20.46%)	⬇️

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[canemacchina]

@alessandro-aglietti @gianmarcobrescia @pietrovismara guardate un po'. Può far comodo che al frontend quindi gli stage arrivino sotto forma di array (sempre 2 array separati, mandatory e no?)
O vogliamo tenere questa rappresentazione a dizionario?

[pietrovismara]

Per me viene leggermente più pulito in frontend, percui va bene, mi evito una conversione in Number.