add getter for the arrival waypoints

src/types/ArrivalWaypoint.cpp

@@ -35,3 +35,15 @@ const std::string& ArrivalWaypoint::name() const noexcept {
 const GeoCoordinate& ArrivalWaypoint::position() const noexcept {
     return this->m_position;
 }
+
+const Length& ArrivalWaypoint::altitude() const noexcept {
+    return this->m_altitude;
+}
+
+const Velocity& ArrivalWaypoint::indicatedAirspeed() const noexcept {
+    return this->m_indicatedAirspeed;
+}
+
+const UtcTime::Point& ArrivalWaypoint::plannedArrivalTime() const noexcept {
+    return this->m_plannedArrivalTime;
+}