More accurate 3rd-party library filtration

[dfed]

Some 3rd party modules have custom paths, which results in us parsing way more files than needed.

There isn't a foolproof way to find out if a module is 3rd party, but this comes reasonably close.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.59%. Comparing base (10726cb) to head (cc19f89).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #117   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
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  Files          33       33           
  Lines        2728     2728           
=======================================
  Hits         2717     2717           
  Misses         11       11