SIB19 utilization on UE

Following SIB19 initialization and scheduling on gNB (!2899 - merged) and Receive SIB19 on nrUE (!2920 - merged), this merge request aims to introduce the actual use of the SIB19 provided parameters by gNB in UE. Changes needed for utilization include: initialization of position coordinates parameters for UE (which are needed to calculate propagation delay between UE and SAT), propagation delay calculations and timing advance adjusts. Moreover, this change removes the now unused arguments for ntn_koffset, ntn_ta_common and ntn_ta_commondrift.