Embed hash value in hash type entry #1579
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For a hash type key represented as a hash table, embed the field and value in one allocation when they together fit in the size of one cache line. For larger fields and values, another layout is used where the value is a separately allocated sds string.
This is a follow-up of #1502, where a field-value entry was created where the field is embedded and the value is a pointer to a separately allocated sds value.