update RawStorage related code

[wokron]

No description provided.

[Copilot]

Pull request overview

This PR updates condy::RawStorage to support in-place construction via a factory (enabling guaranteed copy elision for non-movable/non-copyable types), modernizes object access with std::launder, and adjusts tests and coroutine allocator cleanup to match the updated storage/lifetime patterns.

Changes:

• Add RawStorage::accept(Factory) and re-route construct(...) through it to enable guaranteed copy elision scenarios.
• Use std::launder when retrieving objects from raw storage, and similarly launder the allocator pointer in coroutine deallocation.
• Extend unit tests to cover a non-movable/non-copyable type construction path.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/test_utils.cpp	Updates RawStorage test usage and adds a guaranteed copy-elision test case.
include/condy/utils.hpp	Introduces RawStorage::accept, updates construct, and changes get() to use std::launder.
include/condy/coro.inl	Adds <new> and uses std::launder when accessing the stored allocator during coroutine deallocation.

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