Move normal() to DistributionTemplates (#35167)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35167
The purpose of this PR is to move `normal`/`normal_`/`normal_out` to `native/DistributionTemplates.h`, `native/cpu/DistributionTemplates.h` and `native/cuda/DistributionTemplates.h` to make it reusable for custom RNG, see cpu_rng_test.cpp as an example of custom RNG.
Test Plan: Imported from OSS
Differential Revision: D20588248
Pulled By: pbelevich
fbshipit-source-id: 7ee60be97f81522cd68894ff1389007c05130a60
