Per-Array Backend Configuration for Seamless CPU and GPU Integration

[bradbrett]

Implementing per-array backend configuration in ArrayFire for versatile CPU and GPU utilization, providing developers with a seamless experience without the need for manual switching.

Description

Introducing the capability to specify a backend on a per-array basis, rather than just globally, would be beneficial. This feature would streamline the seamless utilization of ArrayFire for both CPU and GPU operations, eliminating the manual switching requirement every time a specific array is employed.