Add a way to use other device physical features

[chatpion]

Right now devices created by Manager don't enable any additional physical device features. In my case, I would like to be able to work with 8-bit types in my shaders, which requires vk::PhysicalDevice8BitStorageFeaturesKHR. It would nice if there was a way to add physical features without having to create a vkDevice myself.

[axsaucedo]

Thank you for opening the issue @chatpion , this sounds interesting, it may be worth exploring a way in which there can be more flexibility to initialize the components. At this point this may be a bit harder as it is expected for either a limited initialisation of Vulkan core resources, vs a more custom one where you would have to create the vkDevice yourself. Mainly as otherwise it would be come almost an endless list of parameters to an extent whre we'd be replicating the initialisers of not only the Device but also the Instance, etc.

[koubaa]

See #406