Add a pre-process function for removing the prompt info

[SimFG]

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[codecov]

Codecov Report

Merging #186 (464b0e0) into dev (8f71242) will increase coverage by 0.35%.
The diff coverage is 94.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #186      +/-   ##
==========================================
+ Coverage   79.98%   80.33%   +0.35%     
==========================================
  Files          40       41       +1     
  Lines        1189     1200      +11     
==========================================
+ Hits          951      964      +13     
+ Misses        238      236       -2     

Impacted Files	Coverage Δ
gptcache/adapter/adapter.py	92.45% <ø> (ø)
gptcache/manager/data_manager.py	86.27% <0.00%> (ø)
gptcache/__init__.py	95.34% <100.00%> (+0.05%)	⬆️
gptcache/adapter/openai.py	67.74% <100.00%> (+0.09%)	⬆️
gptcache/processor/pre.py	100.00% <100.00%> (+6.66%)	⬆️
gptcache/utils/response.py	100.00% <100.00%> (ø)