Fix: select_subclass now supports dotted class names (Fixes #56)

[RajT393]

📝 Summary

This pull request fixes Issue #56 by updating the select_subclass() selector to correctly match class definitions that inherit from dotted base class names (e.g., module.BaseClass), which were previously ignored.

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🐞 Problem

The select_subclass() selector in bowler/query.py only supported simple base class names like BaseClass.
It failed to match subclasses that inherit from dotted names such as module.BaseClass, because it didn’t traverse ast.Attribute nodes in the AST.

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✅ Fix

The function has been enhanced to:

• Handle both Name and Attribute nodes in the AST
• Correctly match dotted base class names (e.g., module.BaseClass)

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🧪 Changes Made

• ✅ Updated logic in select_subclass() to walk through Attribute nodes
• ✅ Added a test in tests/test_query.py to verify subclass matching with dotted base classes
• ✅ Ensured all existing tests pass (pytest ran successfully)

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🔍 Example

Before:

class Derived(module.BaseClass):
    pass
# ❌ Not matched

After:

class Derived(module.BaseClass):
    pass
# ✅ Matched by select_subclass("module.BaseClass")

---

🔗 Related Issue

Fixes #56

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