Dev refactor generator (#5397)

* add random generator

* reformat

* refactor: allow auto generator

* refactor: remove kAUTO, update python api and test

* refactor: use member initializer lists, fix build issue when cpu only

* handle exeception given invalid device

* add dropout functor; add OpExprInterpContext; refactor random_mask_like based on random_generator

* refactor random generator

* Cast explicitily in unpack call to avoid confilt with Optional.

* Refactor generator

* Fix bad merge

* Refine

* Private default generator for each cuda device.

* Fix

* Refactor generator and refine unittest

* add lock; refine testcase

Co-authored-by: VertexC <bob2420083992@gmail.com>
Co-authored-by: oneflow-ci-bot <69100618+oneflow-ci-bot@users.noreply.github.com>