Optimize Python key extraction using cast instead of extract

[bisho]

Motivation / Description

Optimize key extraction performance by avoiding expensive error conversions when checking Python object types.

This is minimal but measurable -.2us and best practices (pyo3 recommends cast)

Changes introduced

• Replace extract() calls with cast() in extract_key() function to avoid costly PyDowncastError to PyErr conversions
• Add explicit imports for PyBytes and PyString types to support the new casting approach
• Maintain the same functionality while improving performance for the success path when extracting string and bytes keys

[bisho]

• Bump version to 0.2.0 #21
• Optimize Python key extraction using cast instead of extract #20 👈 (View in Graphite)
• main

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[bisho]

Merge activity

• Mar 26, 12:58 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Mar 26, 12:59 PM UTC: @bisho merged this pull request with Graphite.