Add novalues option to command HSCAN. (#12765)
Add a way to HSCAN a hash key, and get only the filed names.
Command syntax is now:
```
HSCAN key cursor [MATCH pattern] [COUNT count] [NOVALUES]
```
when `NOVALUES` is on, the command will only return keys in the hash.
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Co-authored-by:
Viktor Söderqvist <viktor.soderqvist@est.tech>
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