PHPC-1737: Use zend_hash_graceful_reverse_destroy for persistent client HashTable #1191
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https://jira.mongodb.org/browse/PHPC-1737
Also includes a second commit improving the comments for request-scoped HashTables.
I manually tested that
zend_hash_graceful_destroy
causes a segfault forkeyVaultClient
tests, so we can be certain thatzend_hash_graceful_reverse_destroy
is doing its job.