NVIDIA CUDA C++ Core Library (CCCL)

The `nvidia-cuda-cccl-cu12` package provides the CUDA C++ Core Library (CCCL) headers and potentially compiled artifacts for CUDA Toolkit 12.x. CCCL is a collection of essential C++ utilities and primitives (like Thrust, CUB, libcudacxx) used for high-performance CUDA programming. This package is primarily a build and runtime dependency for other Python libraries that leverage specific CUDA Toolkit versions and C++ features, rather than offering direct Python APIs for end-user applications.