Add attributes and units for trip data

[MasterTim17]

I want to have access to the last trip data from my car. This PR adds the Attributes and units required for displaying trip data.
Following trip data entities will be created via the connector (which will be following repo https://github.com/MasterTim17/CarConnectivity-connector-seatcupra )

last_trip_distance
last_trip_average_speed
last_trip_duration
last_trip_electric_consumption
last_trip_fuel_consumption

Solves tillsteinbach/CarConnectivity-connector-seatcupra#22

[tillsteinbach]

Hi @MasterTim17, thanks for your contribution. I have not yet determined how to properly implement trips because of the very different implementation across different brands.
VW for example has 3 kinds of trips (short term, longterm and since last fueling/charging). Also some brands allow to see more than just the last trip. So I first need to come up with the right structure that works for all.

[MasterTim17]

Alright,
if anyone needs this function for cupra and with a homeassistant addon via mqtt, here my modified homeassistant addon
https://github.com/[MasterTim17/carconnectivity-addon](https://github.com/MasterTim17/carconnectivity-addon)