Feat/groupby transform

[paddymul]

• re-enables polars 1.9 by disabling histogram tests ** Polars has changed the behavior of histograms a lot with recent releases, disabling them allows for a little more stability. Tests will be revisited with
• Adds commands of make_category, rank, drop_duplicates, and replace
• Adds many aggregation methods to group by and groupby_transform
  • mean
  • Return the mean value.
  • median
  • Return the median value.
  • min
  • Return the minimum value.
  • max
  • Return the maximum value.
  • sum
  • Return the sum of the series.
  • count
  • Returns count of non-missing values.
  • count_null
  • Returns count of missing values.
  • std
  • Return the standard deviation of the data.
  • empty
  • True if no values in series.
  • hasnans
  • True if missing values in series.
  • nunique
  • Return the count of unique values.
  • is_monotonic
  • True if values always increase.
  • is_monotonic_decreasing
  • True if values always decrease.
  • is_monotonic_increasing
  • True if values always increase.
  • all
  • Returns True if every value is truthy.
  • any
  • Returns True if any value is truthy.
  • autocorr
  • Returns Pearson correlation of series with shifted self. Can override lag as keyword argument(default is 1).
  • kurt
  • Return ”excess” kurtosis (0 is normal distribution). Values greater than 0 have more outliers than normal.
  • mad
  • Return the mean absolute deviation.
  • sem
  • Return the unbiased standard error.
  • skew
  • Return the unbiased skew of the data. Negative indicates tail is on the left side.
  • idxmax
  • Returns index value of maximum value.
  • idxmin
  • Returns index value of minimum value.
  • dtype
  • Type of the series.
  • dtypes
  • Type of the series.
  • nbytes
  • Return the number of bytes of the data.
  • ndim
  • Return the number of dimensions (1) of the data.
  • size
  • Return the size of the data.