Port to AMD GPUs (and other backends?)

[pdziekan]

porting to AMD:

1. Implementation of Thrust for HIP and CUDA:
   https://github.com/ROCmSoftwarePlatform/rocThrust

2. CUDA code can be translated with Hipify:
   https://github.com/ROCm-Developer-Tools/HIPIFY

porting to SYCL (which can be run on many backends):

1. SYCLomatic:
   https://github.com/oneapi-src/SYCLomatic