Distance Sensor Capability

Split out from #83 

A distance sensor which measures how far away an object is (e.g. Ultrasonic, ToF IR, LiDAR)

# Capabilities

## DistanceSensor

### Properties

| Type | Read-only | Required |
| ----- | ----------- | ---------|
| DistanceProperty | Yes | Yes |

# Properties 

## DistanceProperty

- type: number
- unit: meter