celerity / celerity-runtime / 10074265948 / 1

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Introduce new backend and executor infrastructure

'executor' has two implementations, live_executor (for normal execution)
and dry_run_executor for dry runs. The live_executor maintains the state
persistent between instructions, such as memory allocations, but
delegates all state management complexity to out_of_order_engine and
receive_arbiter.

'backend' is an abstract interface for executing any operation that
might touch backend-allocated memory. The interface itself is
independent of SYCL, and the tie-in happens with the sycl_backend
derived class. Backend specialization for CUDA nd-copies is achieved
by instantiating either a sycl_generic_backend or a sycl_cuda_backend.

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