Cycles already treats denoising fairly separate in its code, with a dedicated `Denoiser` base class used to describe denoising behavior. That class has been fully implemented for OIDN (`denoiser_oidn.cpp`), but for OptiX was mostly empty (`denoiser_optix.cpp`) and denoising was instead implemented in the OptiX device. That meant denoising code was split over various files and directories, making it a bit awkward to work with. This patch moves the OptiX denoising implementation into the existing `OptiXDenoiser` class, so that everything is in one place. There are no functional changes, code has been mostly moved as-is. To retain support for potential other denoiser implementations based on a GPU device in the future, the `DeviceDenoiser` base class was kept and slightly extended (and its file renamed to `denoiser_gpu.cpp` to follow similar naming rules as `path_trace_work_*.cpp`). Differential Revision: https://developer.blender.org/D16502
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