Get heading from assets

Hi!

We are trying to use Samsara to get the heading of our assets, but this seems to only be available with vehicles. We have trailers that we would like to track and display on status screens but currently the only way we can get headings is to calculate it based on previous coordinates.

Seeing as Samsara already knows the heading (based on what I can see from the Dashboard), it seems reasonable to have it available via the API.