pldmtool: Add NumericSensor PDR

Added NumericSensor PDR to provide general sensor information,
such as the factors that are used for converting raw sensor
readings to normalized units, etc.

Tested result:
```
root@bmc:~# pldmtool platform getPdr -m9 -t numericSensor | head
[
,,,,,{
    "nextRecordHandle": 1301,
    "responseCount": 105,
    "recordHandle": 1300,
    "PDRHeaderVersion": 1,
    "PDRType": "Numeric Sensor PDR",
    "recordChangeNumber": 0,
    "dataLength": 95,
    "PLDMTerminusHandle": 100,
```

Change-Id: If64fc9d538dc673dacfba6e4c2dd2360cfe50a68
Signed-off-by: Ruslan Magomedov <velochimc@mail.ru>