API access and mail confirmed

[gpopac]

1. Currently, user is not able to access some APIs before email is confirmed. To simplify implementation in the applications we should enable users to access this APIs:
   view-groups
   taxa
   observation-types
   elevation

2. There should be a simple call to get response if email is confirmed. It could be implemented in my/profile API?

[nikazooz]

@gpopac Why is elevation endpoint needed? To me it doesn't make sense for non-verified users to use it, similarly to how they should not be able to add observations.

[gpopac]

@nikazooz This is OK. We can let user download data about taxa, but the user should not be able to create new record before the account is verified. My original idea was to let user create observation, but not to let him upload data on server.

[gpopac]

@nikazooz Implemented in Biologer for Android: Biologer/Biologer-Android@776729f