feat: don't use pinned memory for cpu backend (PROOF-831) #132
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Rationale for this change
Rework cpu backend so that it doesn't use pinned memory. Pinned memory requires that CUDA drivers be up-to-date which makes the library less portable. And if the GPU isn't available there's no benefit for it anyways.
What changes are included in this PR?
Customize computational backend so that it only uses pinned memory for the gpu backend.
Are these changes tested?
Yes