fix: include interfaces in superclass relationships

[wenxiaojie1]

Summary

• include implemented interfaces in superclass_relationships
• add a regression test covering a class with a parent and two interfaces

Validation

• python -m compileall -q quark/core/apkinfo.py tests/core/test_apkinfo.py
• git diff --check
• verified the expected set-update behavior with a minimal local fixture

The targeted pytest invocation could not be collected locally because this machine lacks the project's pinned androguard==3.4.0a1 dependency; the new regression test will run in the repository CI environment.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.27%. Comparing base (0a39d96) to head (3e5354a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #953   +/-   ##
=======================================
  Coverage   80.27%   80.27%           
=======================================
  Files          82       82           
  Lines        7185     7185           
=======================================
  Hits         5768     5768           
  Misses       1417     1417           

Flag	Coverage Δ
unittests	80.27% <100.00%> (ø)

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[haeter525]

Hi @wenxiaojie1, thanks for the PR!