Get a list of all capacity providers for which accounts can be set up.

Provides a list of all capacity providers for which accounts can be set up within project44.

Note that in some cases, like with truckload tracking, a capacity provider account is not needed to connect to a capacity provider -- e.g., if project44 has an ELD connection set up with that capacity provider directly. In these cases, that capacity provider will not currently be returned by this API. This API is solely for capacity providers requiring account information.