Add StatsForecastAutoARIMA to sk skaters

[microprediction]

Concrete and pretty easy one. Simply need to include sktime's wrapping of Nixtia's fast autoarima.

Steps:

1. See skwrappers for example and make sf_autoarima_iskater in the mold of sk_autoarima_iskater

2. Then add another function to skautoarima to include it, this is just a one-liner.

Don't forget to review steps for adding batch style models

[microprediction]

Peter workin on it

[microprediction]

Done!