Adding support for WITHSCORE in zrank

[SoulPancake]

closes #2758
closes #2689

[chayim]

@SoulPancake I updated your code to fix the linter issue. Maybe take a stab at it from here?

[codecov-commenter]

Codecov Report

Patch coverage: 47.05% and project coverage change: -0.04 ⚠️

Comparison is base (2d9b5ac) 92.30% compared to head (c8ebdeb) 92.26%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2698      +/-   ##
==========================================
- Coverage   92.30%   92.26%   -0.04%     
==========================================
  Files         116      116              
  Lines       30214    30229      +15     
==========================================
+ Hits        27888    27891       +3     
- Misses       2326     2338      +12     

Impacted Files	Coverage Δ
tests/test_asyncio/test_commands.py	97.70% <33.33%> (-0.19%)	⬇️
tests/test_commands.py	89.71% <33.33%> (-0.11%)	⬇️
redis/commands/core.py	82.05% <80.00%> (-0.03%)	⬇️

... and 2 files with indirect coverage changes

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[SoulPancake]

@chayim Can you take a look at this

[chayim]

LGTM @SoulPancake . Thank you for revisiting!

[uglide]

The PR title was misleading. I've updated it.

[chayim]

@dvora-h given #2758 being merged, maybe you can double-check this?

[dvora-h]

Closing as this is already merged in #2758.
(Sorry, @SoulPancake I missed it before I merged)