Overrides the TypeMapInitializer#query_conditions_for_initial_load method to use a faster query that doesn't rely on 'array_in(cstring,oid,integer)'::regprocedure.

That part of the condition can be replaced with

t.typarray = 0 AND t.typcategory='A'

This can be verified by comparing the following queries:

SELECT t.oid, t.typinput, t.typarray, t.typcategory FROM
pg_type as t WHERE t.typinput='array_in(cstring,oid,integer)'::regprocedure
ORDER BY t.oid;

SELECT t.oid, t.typinput, t.typarray, t.typcategory FROM
pg_type as t WHERE t.typarray=0 AND t.typcategory='A' ORDER BY t.oid;

the second query is about 10x faster for me.

A potential issue is that these do not return the same results in Postgres (a few records are missing from the second) so the queries could eventually diverge depending on updates to Cockroach.

This is related to cockroachdb/cockroach#61082.