Add require_results attribute to the Vulkan procedures that return vulkan.Result

[SolidAlloy]

A lot of Vulkan procedures return a vulkan.Result value that needs to be checked. It is commonly implemented with a vk_check() procedure. However, there are a number of void procedures. Thus, it is easy to miss checking the return value of a Vulkan call because not every function needs it, and if you forget, it doesn't pop up as an error.

The proposal is to tweak the bindings generator to add the require_results attribute to any Vulkan function that returns vulkan.Result.