no support for `VkBufferUsageFlags2CreateInfoKHR`

[qbojj]

Vma in many places (e.g vmaCreateBuffer) assumes that usage information is in p*CreateInfo->usage but with VK_KHR_maintenance5 it can be in VkBufferUsageFlags2CreateInfoKHR in the pNext chain

[adam-sawicki-a]

Thank you for reporting this. I agree this is a deficiency that should be fixed ASAP. I added support for this. Please let me know if it looks good to you.

[qbojj]

LGTM