feat(SeriesAggreg): Add internal quantile function

Fix #82
4 jobs for 82-add-min-max-and-median-function-in-seriesaggreg in 12 minutes and 36 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #141681
build_patched

00:00:26

 
  Regression
passed #141682
regression_patched

00:00:59

 
  Tests
passed #141684
check_as_cran_patched

00:02:11

passed #141683
check_not_cran_patched

00:08:57