refactor(config): remove unimplemented measurement types

Remove NTP and TCP timestamp variants from the measurement type configuration since they are currently unimplemented and lead to runtime panics.

src/main.rs

@@ -95,9 +95,6 @@ fn create_pinger(measurement_type: MeasurementType) -> (PingListenerBox, PingSen
             Box::new(PingerICMPTimestampListener {}),
             Box::new(PingerICMPTimestampSender {}),
         ),
-        MeasurementType::Ntp | MeasurementType::TcpTimestamps => {
-            todo!()
-        }
     }
 }