integrate nn.image.flip (#5411)

* init nn.image.flip

* clean code

* add unit test.

* revert python.cmake

* auto format by CI

* resolve comments

* add functor

* fix image_flip

* fix testcase

* fix warning:  Unexpected indentation

Co-authored-by: oneflow-ci-bot <ci-bot@oneflow.org>
Co-authored-by: simonJJJ <821898965@qq.com>
Co-authored-by: oneflow-ci-bot <69100618+oneflow-ci-bot@users.noreply.github.com>