Add openai audio adapter

[shiyu22]

No description provided.

[codecov]

Codecov Report

Merging #220 (6c12e20) into dev (f7587d2) will decrease coverage by 0.09%.
The diff coverage is 92.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #220      +/-   ##
==========================================
- Coverage   92.64%   92.56%   -0.09%     
==========================================
  Files          48       48              
  Lines        1509     1546      +37     
==========================================
+ Hits         1398     1431      +33     
- Misses        111      115       +4     

Impacted Files	Coverage Δ
gptcache/adapter/openai.py	91.26% <90.90%> (-1.52%)	⬇️
gptcache/processor/pre.py	100.00% <100.00%> (ø)
gptcache/utils/response.py	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

[SimFG]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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