Remove PyQualifier and ConstPyQualifier classes

[tomaskontrimas]

Introduced in 8a64418 but never used in the package. Removing them as they would make typing and inheritance inspection even more difficult.

[Copilot]

Pull request overview

This PR removes the unused PyQualifier / ConstPyQualifier mechanism from skyllh.core.py, simplifying runtime typing/inspection utilities and aligning the test suite with the reduced API surface.

Changes:

• Removed PyQualifier, ConstPyQualifier, and the const instance from skyllh/core/py.py.
• Simplified issequenceof by dropping qualifier-filtering support and reducing it to a pure isinstance sequence check.
• Updated tests/core/test_py.py by removing qualifier-related tests and imports.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
skyllh/core/py.py	Deletes qualifier classes and simplifies issequenceof implementation/signature accordingly.
tests/core/test_py.py	Removes tests/imports that exercised the deleted qualifier behavior.

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[Copilot]

Removing the optional pyqualifiers parameter from issequenceof is a backwards-incompatible public API change (callers passing the 3rd argument will now get a TypeError). If this function is part of the supported API, consider keeping the parameter (e.g., pyqualifiers=None or *pyqualifiers) for compatibility and either ignoring it or raising a clear error when non-None is provided, with a deprecation path if desired.

[tomaskontrimas]

no