Add sorted set functions to RedisCache

[Nazhixx]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 37.50000% with 85 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.6%. Comparing base (0756a8b) to head (d303159).
⚠️ Report is 232 commits behind head on master.

Files with missing lines	Patch %	Lines
django_redis/client/default.py	20.0%	68 Missing ⚠️
django_redis/cache.py	66.7%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #673      +/-   ##
=========================================
+ Coverage    60.0%   83.6%   +23.6%     
=========================================
  Files          39      21      -18     
  Lines        2534    1181    -1353     
  Branches       69       0      -69     
=========================================
- Hits         1520     987     -533     
+ Misses       1001     194     -807     
+ Partials       13       0      -13     

Flag	Coverage Δ
mypy	?
tests	83.6% <37.5%> (-5.9%)	⬇️

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[WisdomPill]

nice effort but I see no tests nor changelog and I am afraid that without those this PR can't be merged