New features: queue family selection and Gpu class.

[stripe2933]

This PR adds two new features:

• Queue family selection helper: get queue family index from enumerated queue family properties, with typical usage pattern (some compute/transfer specialized queue family fetch). Implemented in queue.cppm file.
• New class Gpu<QueueFamilies, Queues>: this class bootstraps the physical device, device, queues and allocator creation with simplified parameter passes.