Make CUDA a package extension - #68
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CUDA moves from `[deps]` to `[weakdeps]` behind a new `CUDAExt`, so installing and loading ParallelMCMC no longer drags the CUDA stack onto machines that cannot use it. `using ParallelMCMC` alone now leaves CUDA unloaded. The samplers were already array-type-agnostic everywhere but the random fills — MALA's normal noise and DEER's Rademacher probes — which cannot be written into device memory one element at a time. Those four `isa CuArray` checks all asked the same question, so they collapse into one trait, `needs_host_staging(x)`, defaulting to `false`. `_rademacher!` loses its two `CuArray` dispatches for a trait branch in the generic method. The extension is a single method setting that trait for `CuArray`, which also drops the NVIDIA-only assumption: an AMDGPU or Metal user adds one method rather than waiting on another extension.
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Closes #59.
CUDA moves from
[deps]to[weakdeps]behind a newCUDAExt, so installing andloading ParallelMCMC no longer drags the CUDA stack onto machines that cannot use
it.
using ParallelMCMCon its own now leaves CUDA unloaded; GPU runs areunchanged apart from needing
using CUDAalongside it, which they already did tobuild the
CuArrays in the first place.