Add a limit to the number of RR types for single name

Previously, the number of RR types for a single owner name was limited
only by the maximum number of the types (64k).  As the data structure
that holds the RR types for the database node is just a linked list, and
there are places where we just walk through the whole list (again and
again), adding a large number of RR types for a single owner named with
would slow down processing of such name (database node).

Add a configurable limit to cap the number of the RR types for a single
owner.  This is enforced at the database (rbtdb, qpzone, qpcache) level
and configured with new max-types-per-name configuration option that
can be configured globally, per-view and per-zone.

(cherry picked from commit 00d16211d6368b99f070c1182d8c76b3798ca1db)

bin/tests/system/dyndb/driver/db.c

@@ -612,7 +612,8 @@ static dns_dbmethods_t sampledb_methods = {
 	NULL, /* setservestalerefresh */
 	NULL, /* getservestalerefresh */
 	NULL, /* setgluecachestats */
-	NULL  /* setmaxrrperset */
+	NULL, /* setmaxrrperset */
+	NULL  /* setmaxtypepername */
 };
 
 /* Auxiliary driver functions. */