[add] support for redis cache storage

[a9raag]

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[codecov]

Codecov Report

Merging #465 (30c28ee) into dev (34c11f0) will increase coverage by 0.08%.
The diff coverage is 96.05%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #465      +/-   ##
==========================================
+ Coverage   93.99%   94.08%   +0.08%     
==========================================
  Files          92       93       +1     
  Lines        3583     3735     +152     
==========================================
+ Hits         3368     3514     +146     
- Misses        215      221       +6     

Impacted Files	Coverage Δ
gptcache/manager/scalar_data/manager.py	83.33% <33.33%> (-7.15%)	⬇️
gptcache/manager/scalar_data/redis_storage.py	97.29% <97.29%> (ø)
gptcache/utils/__init__.py	89.83% <100.00%> (+0.08%)	⬆️