feat: ARIMA models

[albersonmiranda]

This PR adds ARIMA modelling to augurs.

Closes #450 .

• Crate setup
• Error type
• Kalman Filter
• Estimation
• Unit root tests (ADF and KPSS)
• Forecasting
• Tests: AirPassengers

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[albersonmiranda]

Huge milestone reached today: Arima parameter estimation is done! Matches perfectly R's stats::ar() (Yule-Walker) for initial values and stats::arima() with css, ml and css-ml methods.