Bump version to 0.1.6 and optimize performance

[bisho]

Motivation / Description

This release optimizes performance and improves code quality through dependency updates, SIMD-accelerated string operations, and comprehensive test coverage.

Changes introduced

• Bump version to 0.1.6 and update Cargo.lock format to version 4
• Update dependencies: autocfg (1.4.0 → 1.5.0), cfg-if (1.0.0 → 1.0.4), indoc (2.0.5 → 2.0.7), libc (0.2.164 → 0.2.183), once_cell (1.20.2 → 1.21.3), portable-atomic (1.10.0 → 1.13.1), proc-macro2 (1.0.92 → 1.0.106), pyo3 suite (0.23.1 → 0.23.5), quote (1.0.37 → 1.0.45), syn (2.0.89 → 2.0.117), unicode-ident (1.0.14 → 1.0.24), unindent (0.2.3 → 0.2.4)
• Add itoa and memchr dependencies for optimized integer-to-string conversion and SIMD-accelerated memory operations
• Replace manual \r\n search loop with memchr's SIMD-accelerated memmem::find in header parsing
• Replace .to_string() calls with itoa::Buffer for faster integer serialization
• Optimize binary key detection using iterator any() method instead of manual loop
• Add empty key validation to reject zero-length keys
• Implement Clone and PartialEq derives for RequestFlags and ResponseFlags structs
• Simplify equality comparison methods using derived PartialEq implementation
• Pre-allocate Vec capacity in RequestFlags::to_bytes for better memory efficiency
• Add comprehensive test suites for RequestFlags and ResponseFlags with 100+ test cases covering edge cases, boundary conditions, and flag combinations
• Fix numeric literal type annotation from 65 as u8 to b'A' for better readability

[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 👈 (View in Graphite)
• Update to PyO3 Bound API #10
• 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, 4:59 PM UTC: Graphite rebased this pull request as part of a merge.
• Mar 24, 5:01 PM UTC: @bisho merged this pull request with Graphite.