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This MR introduces the fundamentals of GPU support to the new backend
General
Introduce GenericGpu platform and threads range export: GPU platforms communicate the kernel's required thread grid size to the outside via a GpuThreadsRange object separate from the AST
Add configuration options relating to GPUs
CUDA Platform
Introduce CUDA platform
Add materialization + guards for full and sparse iteration spaces
Add materialization of math functions
SYCL Platform
Introduce SYCL platform
Add materialization + guards for full and sparse iteration spaces
Add materialization of math functions
CUDA Just-In-Time Compiler
Migrate implementation of cupy-based JIT to new backend as an object-oriented structure
Deviations and Missing Features
In the new implementation, block size selection is entirely up to the JIT / the runtime system and no longer affects the backend.
Adaptive block sizes, register restrictions, etc. are not yet implemented by this MR.
