Add UserType attribute to User + Add possibility to create Public surveys to Admins

[rfontanarosa]

closes #2225

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.40%. Comparing base (de82626) to head (0106cd5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2491      +/-   ##
==========================================
+ Coverage   60.24%   60.40%   +0.15%     
==========================================
  Files         115      115              
  Lines        2830     2836       +6     
  Branches      425      426       +1     
==========================================
+ Hits         1705     1713       +8     
+ Misses       1064     1062       -2     
  Partials       61       61              

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