chore: move function get_package_dirinto packsmanager.py

[ycexiao]

What problem does this PR address?

Closes #57

Move get_package_dir from __init__.py to packsmanager.py

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.93%. Comparing base (7659ba1) to head (440d54b).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #62   +/-   ##
=======================================
  Coverage   82.93%   82.93%           
=======================================
  Files          13       13           
  Lines        1313     1313           
=======================================
  Hits         1089     1089           
  Misses        224      224           

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[ycexiao]

@sbillinge, it's ready for review.

[sbillinge]

Yes, that's it. Thanks ,@ycexiao !