DRILL-4566: TDigest, median, and quantile functions #456
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Adds tdigest, tdigest_merge, median, and quantile UDFS
Adds reduce aggregates rule to reduce:
median(x) -> tdigest_median(tdigest(x))
quantile(q, x) -> tdigest_quantile(q, tdigest(x))
Adds two-phase aggregate rule for tdigest
Also adds ability to specify tolerances in the TestBuilder