feat: Generate std-index.txt

[kesara]

Fixes #10663

Sample: std-index.txt

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.44%. Comparing base (5775077) to head (46db1e1).
⚠️ Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10665      +/-   ##
==========================================
+ Coverage   88.39%   88.44%   +0.04%     
==========================================
  Files         326      330       +4     
  Lines       43813    44317     +504     
==========================================
+ Hits        38727    39194     +467     
- Misses       5086     5123      +37     

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