Introduce a SQL-callable function array_sort(anyarray).

Create a function that will sort the elements of an array
according to the element type's sort order.  If the array
has more than one dimension, the sub-arrays of the first
dimension are sorted per normal array-comparison rules,
leaving their contents alone.

In support of this, add pg_type.typarray to the set of fields
cached by the typcache.

Author: Junwang Zhao <zhjwpku@gmail.com>
Co-authored-by: Jian He <jian.universality@gmail.com>
Reviewed-by: Aleksander Alekseev <aleksander@timescale.com>
Discussion: https://postgr.es/m/CAEG8a3J41a4dpw_-F94fF-JPRXYxw-GfsgoGotKcjs9LVfEEvw@mail.gmail.com

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