* Support the NOVALUES option of HSCAN
Issue #2705
The NOVALUES option instructs HSCAN to only return keys, without their
values. This is materialized as a new command, `hScanNoValues`, given
that the return type is different from the usual return type of `hScan`.
Also a new iterator is provided, `hScanNoValuesIterator`, for the same
reason.
* skip hscan novalues test if redis < 7.4
* Also don't test hscan no values iterator < 7.4
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Co-authored-by: Shaya Potter <spotter@gmail.com>
