feat: Add detailed completion token usage for model callback output

[zhuangjie1125]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.01%. Comparing base (480327f) to head (4630351).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #629      +/-   ##
==========================================
+ Coverage   78.98%   79.01%   +0.03%     
==========================================
  Files         123      123              
  Lines       11520    11520              
==========================================
+ Hits         9099     9103       +4     
+ Misses       1701     1697       -4     
  Partials      720      720              

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