alternate collision checking support

alternate collision checking support

Add full key matching to hashtable

the idea is that on a hash value match we do a full memory comparison of
the unhashed key to validate that its actually the key we're looking for

Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24504)