Commits on Oct 29, 2022

1. Adding min_n and max_n aggregates …

   This adds new aggregates min_n and max_n for getting the n largest or smallest
   values from a column. It will work with integer, float, and timestamptz values.
   These functions will return an aggregate object which can be combined with
   other such objects via rollup. The data can be extracted from the aggregate
   via into_array or into_values methods, which return either an array of the
   values, or a table containing them.
   
   It further adds min_n_by and max_n_by functions that take one of the above
   types plus an associated piece of data (takes this as an AnyElement, so can be
   any type). This will behave the same as the min_n/max_n above, but will also
   return the associated data for the smallest or largest elements. into_array is
   not implemented for these aggregates, as it's not clear what that array would
   look like, and into_values will require a value of the appropriate type as an
   input to allow postgres to determine the function output (suggested approach is
   to just cast a NULL to the type of the associated data).

   Brian Rowe committed Oct 29, 2022
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