[PM-1351][PM-190] Add a mobile service to retrieve feature flags from API (#2431)

src/Core/Abstractions/IStateService.cs

@@ -174,5 +174,7 @@ namespace Bit.Core.Abstractions
         Task SetPreLoginEmailAsync(string value);
         string GetLocale();
         void SetLocale(string locale);
+        ConfigResponse GetConfigs();
+        void SetConfigs(ConfigResponse value);
     }
 }