Add meta command methods to MemcacheSocket

[bisho]

Motivation / Description

This pull request implements comprehensive memcache meta command support with both pipelining and blocking APIs. The implementation adds two tiers of functionality: send_meta_* methods for pipelining (send commands and read responses separately) and meta_* methods for blocking operations (send and receive in one call). The get_response() method is enhanced to automatically read value data for Value responses, eliminating the need for separate get_value() calls.

Changes introduced

• Added send_meta_get, send_meta_set, send_meta_delete, and send_meta_arithmetic methods for pipelining support
• Added meta_get, meta_set, meta_delete, and meta_arithmetic methods for blocking operations
• Enhanced get_response() to automatically read and include value bytes in Value responses
• Implemented automatic NOOP injection for no_reply commands in mutation operations
• Replaced send_all_with_noop() with more flexible send_iovecs() function supporting multiple buffers via writev()
• Refactored value reading logic with improved buffer management and ENDL validation
• Added get_response_with_value() internal method that handles both header parsing and value reading in a single GIL-released block
• Added is_no_reply() helper method to RequestFlags for internal use
• Removed separate get_value() method as value data is now included automatically in Value responses
• Updated error handling to remove retry logic for interrupted system calls
• Enhanced test coverage for all new meta command functionality, pipelining scenarios, and no_reply behavior

[bisho]

• Raw cmd for special usages #17
• multi-get #16
• Move key encoding to socket api #15
• Add meta command methods to MemcacheSocket #14 👈 (View in Graphite)
• 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
• main

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[xmartinez]

Awesome!

Added some nits (nothing blocking, so also approved it).

[bisho]

Merge activity

• Mar 24, 4:58 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Mar 24, 5:09 PM UTC: Graphite rebased this pull request as part of a merge.
• Mar 24, 5:09 PM UTC: @bisho merged this pull request with Graphite.