Adds monitoring for carrier aggregation.

measurement_main.py

 NR_CQI_COMMAND = b'AT+QNWCFG="nr5g_csi"\r\n'
 NR_SERVINGCELL_COMMAND = b'AT+QENG="servingcell"\r\n'
 NR_EN_DC_STATUS_COMMAND = b"AT+QENDC\r\n"
+NE_CA_COMMAND = b'AT+QCAINFO\r\n'
 NR_SERIAL_RESPOND_TIME = 0.5  # s
 CMD_TIME_EPOCH = "date +%s"
 TIMEOUT_OFFSET = 10.0
 
 
 def monitor_serial(ser, output_file):
-    run_cmds = [NR_CQI_COMMAND, NR_SERVINGCELL_COMMAND, NR_EN_DC_STATUS_COMMAND]
+    run_cmds = [NR_CQI_COMMAND, NR_SERVINGCELL_COMMAND, NR_EN_DC_STATUS_COMMAND, NE_CA_COMMAND]
     try:
         while ser.is_open:
             response = subprocess.check_output(CMD_TIME_EPOCH, shell=True).decode(