Add support for multiple values in RPUSHX

[dvora-h]

Pull Request check-list

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Description of change

closes #2941

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01% ⚠️

Comparison is base (012f7cf) 91.38% compared to head (638bd7a) 91.37%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2949      +/-   ##
==========================================
- Coverage   91.38%   91.37%   -0.01%     
==========================================
  Files         126      126              
  Lines       32469    32469              
==========================================
- Hits        29671    29670       -1     
- Misses       2798     2799       +1     

Files Changed	Coverage Δ
redis/commands/core.py	87.35% <100.00%> (ø)

... and 1 file with indirect coverage changes

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