post https://api.mira.co/dmp/audiences/
Creates a new Audience.
The only required parameter is name, but at least one of segment_id,
segment_transform_id, create_segment, or create_segment_transform must be
specified.
Audiences are created by either referencing an existing segment or segment
transform via segment_id and segment_transform_id respectively, or by
embedded the corresponding creation request from either Segments or Segment
Transforms.