Unify API returns to sql composite types, add pattern tests for REST API

Michal Zanderrequested to merge
mzander/add-pattern-tests into develop

Requires haf!634 (merged)

Related with balance_tracker!171 (merged)

  • Unifies API responses - adds exception handling instead of null values in composite types
  • every api returns sql type instead of json
  • fix for /global-state values were shortened by json
  • adds patten tests for REST API
Edited by Michal Zander

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