feat(vectorset): add VISMEMBER & WITHATTRIBS

[romanpovol]

• add VISMEMBER method
• add WITHATTRIBS option for VSIM
• add tests
• improve doctests/vec_set_test.go
• closes missing Vector Sets features (WITHATTRIBS, VISMEMBER) #3747

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Note

Medium Risk
Adds new vector set commands and introduces new RESP2/RESP3 reply parsing paths for VSIM results with attributes, which could mis-parse responses or change expectations across Redis versions.

Overview
Adds VISMEMBER support to the vector set API (VIsMember) and expands VSIM with Redis 8.2+ WITHATTRIBS variants, including new result types (VectorAttrib, VectorScoreAttrib) and command wrappers.

Implements new command reply parsers in command.go to handle both RESP2 arrays and RESP3 maps for WITHATTRIBS (including nil attributes), fixes VSimArgs to emit the lowercase epsilon argument, and updates unit/integration tests plus the vectorset doctest to cover the new functionality.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.