Add the static method for the azure openai

[SimFG]

issue: #506

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[codecov]

Codecov Report

Merging #507 (f8405bd) into dev (58de7f5) will decrease coverage by 0.15%.
Report is 2 commits behind head on dev.
The diff coverage is 40.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #507      +/-   ##
==========================================
- Coverage   94.19%   94.05%   -0.15%     
==========================================
  Files          94       94              
  Lines        3908     3916       +8     
==========================================
+ Hits         3681     3683       +2     
- Misses        227      233       +6     

Files Changed	Coverage Δ
gptcache/core.py	82.81% <25.00%> (-8.26%)	⬇️
gptcache/similarity_evaluation/np.py	100.00% <100.00%> (ø)
gptcache/utils/__init__.py	89.34% <100.00%> (ø)