feat(api): approximate quantiles #9881
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This adds a new
approx_quantilemethod for computing approximate quantiles. Like the corresponding exact version, it can take:col.approx_quantile(0.5)), returning a single scalar resultcol.approx_quantile([0.25, 0.75])), returning an array of resultsUnlike
col.quantile, this is only implemented for numeric types (for now). Most backends support only numeric values for the approximate version, as the algorithms don't easily adapt to non-numeric types. If needed, we could move this to be on a generic type, but most implementations would error for other dtypes.Fixes #9541.