refactor(profiles): turn contact POJO into a class

[faustbrian]

Resolves #446

[codecov]

Codecov Report

Merging #447 into master will increase coverage by 0.60%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #447      +/-   ##
==========================================
+ Coverage   72.01%   72.61%   +0.60%     
==========================================
  Files          50       51       +1     
  Lines         954      975      +21     
  Branches       67       67              
==========================================
+ Hits          687      708      +21     
  Misses        242      242              
  Partials       25       25              

Flag	Coverage Δ
#unit	72.61% <100.00%> (+0.60%)	⬆️

Impacted Files	Coverage Δ
packages/platform-sdk-profiles/src/profile.ts	96.96% <ø> (ø)
packages/platform-sdk-profiles/src/contact.ts	100.00% <100.00%> (ø)
...dk-profiles/src/repositories/contact-repository.ts	97.14% <100.00%> (+0.36%)	⬆️

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