Add date and timestamp variants of random(min, max).

This adds 3 new variants of the random() function:

    random(min date, max date) returns date
    random(min timestamp, max timestamp) returns timestamp
    random(min timestamptz, max timestamptz) returns timestamptz

Each returns a random value x in the range min <= x <= max.

Author: Damien Clochard <damien@dalibo.info>
Reviewed-by: Greg Sabino Mullane <htamfids@gmail.com>
Reviewed-by: Dean Rasheed <dean.a.rasheed@gmail.com>
Reviewed-by: Vik Fearing <vik@postgresfriends.org>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Discussion: https://postgr.es/m/f524d8cab5914613d9e624d9ce177d3d@dalibo.info

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