Use inline classes for the struct DSLs

[Dominaezzz]

At the moment all the struct DSL classes are regular class that wrap a simple platform specific representation of vulkan structs. Since most of these classes only have a single (private) property, they can be inlined and drastically reduce dynamic allocation when calling complex vulkan functions.

This is blocked on KT-26456 or KT-27854 and possibly KT-28056.