Add support for SORT_RO

[dvora-h]

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Description of change

closes #1809

[codecov-commenter]

Codecov Report

Merging #1858 (eee810f) into master (9442d34) will decrease coverage by 0.88%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #1858      +/-   ##
==========================================
- Coverage   93.02%   92.13%   -0.89%     
==========================================
  Files          76      100      +24     
  Lines       16537    21009    +4472     
==========================================
+ Hits        15383    19356    +3973     
- Misses       1154     1653     +499     

Impacted Files	Coverage Δ
redis/commands/core.py	85.82% <63.15%> (-4.34%)	⬇️
tests/test_commands.py	98.76% <100.00%> (-0.64%)	⬇️
tests/test_command_parser.py	94.23% <0.00%> (-5.77%)	⬇️
redis/commands/timeseries/__init__.py	94.73% <0.00%> (-5.27%)	⬇️
tests/conftest.py	87.60% <0.00%> (-2.50%)	⬇️
redis/commands/json/__init__.py	97.56% <0.00%> (-2.44%)	⬇️
redis/commands/parser.py	88.40% <0.00%> (-1.92%)	⬇️
redis/cluster.py	91.93% <0.00%> (-0.50%)	⬇️
... and 40 more

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[chayim]

@dvora-h mind taking a look at the cluster tests?

[chayim]

Where do start and num come from? I dont't see them on the docs page. I see a LIMIT in which case we can align with the command.

[dvora-h]

I did it this way to stay consistent with 'sort', I can change both but I don't think it's a good idea

[chayim]

Agreed. I wish sort didn't look this way now. Fine - better to have two behave the same.