Update client to auto-choose endpoint

[milesgranger]

Problem

Model is more-or-less hard coded to /anomaly/prediction

Context

#368 sets the return code from /anomaly/prediction as 422 Unprocessable Entity if the model is not capable of doing anomaly detection.

Potential solution(s)

Should now be able to set the client to always try /anomaly/prediction first and then switch endpoints to /prediction should the return code be 422

Otherwise we'll need to update the model's metadata to reflect what type of model it is and then decide in the client which endpoint to connect to based on that.