Add batch support for random tf.image.random_flip_* (#19537)

* Add batch support for random tf.image.random_flip_*

* Fixed imports

* Added tests for batched data for tf.image.random_flip_*

* Fixed typo

* Fixed dimension/shape error in _random_flip

* Added unit tests (not benchmarks) for batched data for tf.image.random_flip_*

* Refactored the tf.image.random_flip_* unit tests

* Updated testPartialShapes unit test in image_ops_test

* Fixed formatting

* Fixed imports