Refactor Blocked class to meet allocator requirements

[rfsaliev]

This pull request refactors the Blocked class template to inherit from its allocator type instead of storing it as a member, and updates the associated test to use a struct-based allocator. This change simplifies allocator handling and improves compatibility with standard allocator patterns.

Core class refactoring:

• Blocked now inherits from its allocator type (Alloc) instead of storing an Alloc allocator_ member, which simplifies construction, copying, and access to the allocator. The get_allocator() method now returns *this (as an allocator), and constructors have been updated accordingly.

Test improvements:

• The test for Blocked with an allocator has been updated to use a struct-based allocator (I), which provides a value_type and integer value for testing propagation and compatibility with the new inheritance-based implementation.

[Copilot]

Pull request overview

This PR refactors svs::data::Blocked<Alloc> (public header) to inherit from its allocator type rather than storing it as a member, aiming to better align Blocked with allocator conventions while preserving access to BlockingParameters.

Changes:

• Blocked now derives from Alloc and returns the allocator via *this rather than a stored member.
• Blocked introduces a value_type alias via std::allocator_traits.
• The Blocked allocator test switches from an int “allocator” to a struct with value_type.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
include/svs/core/data/simple.h	Refactors Blocked to inherit from Alloc and updates constructors/accessors accordingly.
tests/svs/core/data/block.cpp	Updates the allocator-propagation test to use a struct-based “allocator” type.

[yuejiaointel]

LGTM, understanding is using class instead of field saves memory because field costs at least 1 byte and class can be empty.

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