Merge pull request !6301 from nhussain/c_py_compose

Leaf ops do self-reset.

embed python compose op

add implicit compose op

more tests

Add ImageBatchFormat to init.

change ImagefolderDV2 name

change ds.transforms.vision to ds.vision

change batch api to match map api more closely

compose op changes

test_pylint

remove compose op from vision, move to transform module, refactor map and batch to use column_order