Extend the duration of an active session

Extend the overall session duration of an active QoS session (with qosStatus = AVAILABLE). The overall duration of the QoS session, including the additional extended duration, shall not exceed the maximum duration limit fixed for the QoS Profile. If the current duration plus the value of `requestedAdditionalDuration` exceeds the maximum limit, the new overall duration shall be capped to the maximum value allowed. An example: For a QoS profile limited to a `maxDuration` of 50,000 seconds, a Qo...