refactor: extract hash operations into HashMixin

[oliverhaas]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 52.17391% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 38.3%. Comparing base (e0c234f) to head (657857d).

Files with missing lines	Patch %	Lines
django_redis/client/mixins/hashes.py	45.0%	3 Missing and 19 partials ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #804     +/-   ##
========================================
+ Coverage    38.2%   38.3%   +0.2%     
========================================
  Files          48      49      +1     
  Lines        3727    3735      +8     
  Branches      301     301             
========================================
+ Hits         1420    1427      +7     
- Misses       2006    2007      +1     
  Partials      301     301             

Flag	Coverage Δ
mypy	38.3% <52.2%> (+0.2%)	⬆️

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