Michał Kępień authored Feb 23, 2022 and Ondřej Surý committed May 17, 2022

Async hooks are the last feature using the client->fetchhandle and
client->query.fetch pointers.  Update ns_query_hookasync() and
query_hookresume() so that they use a dedicated slot in the 'recursions'
array.  Note that async hooks are still not expected to initiate
recursion if one was already started by a prior ns_query_recurse() call,
so the REQUIRE assertion in ns_query_hookasync() needs to check the
RECTYPE_NORMAL slot rather than the RECTYPE_HOOK one.