feature: Zstandard compressor

[vbudovski]

No description provided.

[codecov]

Codecov Report

Merging #551 (2678c05) into master (827eb4e) will increase coverage by 0.2%.
The diff coverage is 100.0%.

@@           Coverage Diff            @@
##           master    #551     +/-   ##
========================================
+ Coverage    83.4%   83.6%   +0.2%     
========================================
  Files          20      21      +1     
  Lines        1157    1171     +14     
  Branches       60      60             
========================================
+ Hits          964     978     +14     
  Misses        187     187             
  Partials        6       6             

Flag	Coverage Δ
mypy	33.3% <61.6%> (+0.4%)	⬆️
tests	82.7% <100.0%> (+0.3%)	⬆️

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Impacted Files	Coverage Δ
django_redis/compressors/zstd.py	100.0% <100.0%> (ø)

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[WisdomPill]

thanks for the PR @vbudovski, just the mypy error is needed to be solved, redis-master is broken for a while now, I will have a look at that and solve it in another issue