feat: add safety_identifier params

[liushuangls]

support safety_identifier params
docs: https://platform.openai.com/docs/api-reference/chat/create#chat_create-safety_identifier

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.59%. Comparing base (f7d6ece) to head (6e09928).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1066   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files          34       34           
  Lines        2206     2206           
=======================================
  Hits         2197     2197           
  Misses          6        6           
  Partials        3        3           

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[sashabaranov]

Thank you!