Add the saved token report, auto flush data

[SimFG]

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[codecov]

Codecov Report

Merging #401 (910427b) into dev (9265b1a) will decrease coverage by 0.12%.
The diff coverage is 91.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #401      +/-   ##
==========================================
- Coverage   94.26%   94.14%   -0.12%     
==========================================
  Files          84       85       +1     
  Lines        2858     2939      +81     
==========================================
+ Hits         2694     2767      +73     
- Misses        164      172       +8     

Impacted Files	Coverage Δ
gptcache/__init__.py	100.00% <ø> (ø)
gptcache/report.py	89.65% <87.75%> (-10.35%)	⬇️
gptcache/adapter/openai.py	92.30% <88.00%> (-0.24%)	⬇️
gptcache/adapter/adapter.py	96.73% <100.00%> (+0.18%)	⬆️
gptcache/adapter/api.py	98.46% <100.00%> (+0.02%)	⬆️
gptcache/config.py	100.00% <100.00%> (ø)
gptcache/utils/__init__.py	90.65% <100.00%> (+0.17%)	⬆️
gptcache/utils/token.py	100.00% <100.00%> (ø)