Implement BatchNormalization functions from cuDNN in juice#146

Draft

colepoirier wants to merge 1 commit intofff-rs:masterfrom

colepoirier:master

Commits on Sep 3, 2021

wrap ffi::cudnnBatchNormalizationForwardTraining() in still unsafe ffi_batch_normalization_forward_training(), but now with a Result return type
colepoirier
committed