missing Vector Sets features (WITHATTRIBS, VISMEMBER)

[romanpovol]

Hi @ndyakov!

While working with Vector Sets, I noticed that go-redis currently doesn't support:

• The WITHATTRIBS parameter in VSIM, refs: Implement WITHATTRIBS for VSIM. redis#14065
• The VISMEMBER command, refs: Vector Sets: VISMEMBER and other fixes redis#13941

If no one is already working on this, I'd be happy to implement these features.

[ndyakov]

@romanpovol I am not aware of anyone working on those at the moment, feel free to implement them. Thank you for reporting this!