Fixes N5014 warning

[owent]

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[Copilot]

Pull request overview

This PR refactors include/memory/allocator_traits.h to fix MSVC warning N5014 by replacing the previously‑exposed memory::allocator_traits<Alloc> helper (which users were expected to inject as a specialization of std::allocator_traits) with a new CRTP-style memory::allocator_adapter<Allocator, T, BackendAllocator> base class. Custom allocators now inherit from allocator_adapter and let the primary std::allocator_traits template detect the inherited nested types and members, avoiding the previously fragile/forbidden specialization of standard-library templates. The test allocator in wal_object_test.cpp is migrated to this new pattern.

Changes:

• Removed the SFINAE-heavy memory::allocator_traits<Alloc> helper plus all detection macros, and introduced allocator_adapter (with is_always_equal/backend-equal helpers and operator==/operator!=).
• Updated the example/header documentation to describe the new adapter-based usage and explicitly warn against specializing std::allocator_traits.
• Migrated test_wal_object_test_allocator in the WAL test to inherit from allocator_adapter and removed the previous std::allocator_traits specialization block.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
include/memory/allocator_traits.h	Replaces the old traits helper with a CRTP allocator_adapter and updates header docs/pragmas.
test/case/wal_object_test.cpp	Updates the test allocator to use allocator_adapter and drops the std::allocator_traits specialization.

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