Task: Consider switching moving_* to polars functions.

[ReinderVosDeWael]

We could consider switching these to e.g.

def rolling_median(arr, window_size):
  df = pl.DataFrame(arr)
  rolling_median = df.select([
        pl.col("*").rolling_mean(window_size)
    ])
  return np.array(rolling_median)

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Original comment by Florian:

Why not use https://docs.pola.rs/py-polars/html/reference/expressions/api/polars.Expr.rolling_median.html and other polars.rolling_* methods instead of implementing all of these?

• Implementing moving_mean function in metrics.py #31
• Adding moving_std to computations #34
• Implementing rolling median function for metrics.py #38

Originally posted by @nx10 in #38 (comment)