Include feature_role as part of JWT

[enriquezrene]

In order to add support for feature toggles in the application, we need to include an additional custom attribute named feature_role which is going to be used to enable/disable toggles. Please refer to this link for more information https://github.com/ioet/time-tracker-ui/wiki/Adding-support-for-Feature-Toggles

Acceptance Criteria

• JWT includes the value of the custom attribute feature_role