system/uorb: add a new uorb topic ENG

[Otpvondoiats]

Summary

• add a new sensor type ENG (Electroneurography).

Depends-on: apache/nuttx#17837.

Impact

• uorb / new sensor type.

Testing

We have conducted tests on the following platforms:
Simulator - single core:pass
BES Platform - multi-core:pass;

grass:/ # uor
uorb_advertise_demo  uorb_downsample      uorb_listener        uorb_rpmsg_test      uorb_unit_test
grass:/ # uorb_listener -n 10 sensor_eng0

Mointor objects num:1
object_name:sensor_eng, object_instance:0
sensor_eng(now:2942986005):timestamp:1555925885,eng0:-0.283753,eng1:4.146453,eng2:-10.340199,eng3:0.000000,status:0x7
sensor_eng(now:2942988113):timestamp:1555930885,eng0:2.807018,eng1:-0.033562,eng2:-3.261632,eng3:0.000000,status:0x7
sensor_eng(now:2942989815):timestamp:1555935885,eng0:4.707857,eng1:0.018306,eng2:-2.935164,eng3:0.000000,status:0x7
sensor_eng(now:2942991548):timestamp:1555940885,eng0:1.281465,eng1:2.248665,eng2:-6.340199,eng3:0.000000,status:0x7
sensor_eng(now:2942993269):timestamp:1555945885,eng0:-5.714722,eng1:2.709382,eng2:-7.572845,eng3:0.000000,status:0x7
sensor_eng(now:2942994463):timestamp:1555950885,eng0:-3.078566,eng1:0.073226,eng2:-4.173913,eng3:0.000000,status:0x7
sensor_eng(now:2942994755):timestamp:1555955885,eng0:2.556827,eng1:-0.070175,eng2:-3.682685,eng3:0.000000,status:0x7
sensor_eng(now:2942995046):timestamp:1555960885,eng0:-0.189169,eng1:1.809306,eng2:-6.468345,eng3:0.000000,status:0x7
sensor_eng(now:2942995230):timestamp:1555965885,eng0:-6.599542,eng1:2.245614,eng2:-7.139588,eng3:0.000000,status:0x7
sensor_eng(now:2942995411):timestamp:1555970885,eng0:-3.130435,eng1:-0.427155,eng2:-3.240275,eng3:0.000000,status:0x7
Object name:sensor_eng0, recieved:10
Total number of received Message:10/10
grass:/ #

[cederom]

Thank you @Otpvondoiats :-)

This PR should build fine after apache/nuttx#17837 is merged :-)

[cederom]

Discussion about new sensor ID in apache/nuttx#17837 needs to be resolved first.