Update to PyO3 Bound API

[bisho]

Motivation / Description

This pull request modernizes the PyO3 bindings to use the newer Bound<'py, T> API instead of the legacy Py<T> API. The changes improve type safety and align with current PyO3 best practices by making Python object lifetimes more explicit.

Changes introduced

• Updated function signatures in build_cmd, build_meta_get, build_meta_set, build_meta_delete, and build_meta_arithmetic to use explicit lifetime parameters and return Bound<'py, PyBytes> instead of Py<PyBytes>
• Removed manual .into() conversions when creating PyBytes objects since PyBytes::new() now directly returns the bound type
• Added eq and skip_from_py_object attributes to RequestFlags and ResponseFlags pyclass declarations
• Added frozen attribute to ResponseFlags pyclass declaration
• Removed manual __eq__ method implementations from both flag classes since they're now handled automatically by the eq attribute
• Updated to_bytes method in RequestFlags to return Bound<'py, PyBytes> with explicit lifetime parameter

[bisho]

• Raw cmd for special usages #17
• multi-get #16
• Move key encoding to socket api #15
• Add meta command methods to MemcacheSocket #14
• Add MemcacheSocket class and response types with CI tests #13
• Bump version to 0.1.7 and add Python 3.13t support #12
• Refactor parse_header to return structured type and update to Rust 2024 #11
• Bump version to 0.1.6 and optimize performance #9
• Update to PyO3 Bound API #10 👈 (View in Graphite)
• main

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[bisho]

Merge activity

• Mar 24, 4:58 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Mar 24, 4:58 PM UTC: @bisho merged this pull request with Graphite.