Add specializations of std::hash for all the structs and handles in the vk-namespace.

[asuessenbach]

Resolves #1943.

[sharadhr]

This looks reasonable to me. @stripe2933 I don't have another compiler at hand to test—would you be able to chime in as well?

[stripe2933]

Tested on Clang 18 and MSVC 14.42. Here's the CI link.

• Clang is not affected by this patch (std::hash<(vulkan-type)>s are implicitly exported by its module implementation nature.
• MSVC affected by this patch. Patch before Patch after

Thank for your efforts.

[asuessenbach]

@stripe2933, @sharadhr: Thanks a lot for your help with this issue!