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Co-authored-by: Richard Barnes <rbarnes@meta.com>

* add api usage log for io

* cover VideoReader

* cover c++ APIs

* add api usage log for io

* cover VideoReader

* cover c++ APIs

* add _cpp suffix to c++ APIs

* use new API and change cpp format

* remove _cpp suffix

* adopt new API

* lint

Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Moving jpegcommon inside cpu implementation

* Adding namespaces on image and moving private methods to anonymous.

* Fixing headers.

* Renaming public image methods to match the ones on python.

* Refactoring to remove the double ifs in common_jpeg.h

Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

Summary:
* Reduce unnecessary header inclusions in models and io.

* Move autocast to separate folder and hide autograd implementation in an anonymous namespace.

* Moving files in subfolders.

Reviewed By: fmassa

Differential Revision: D25461523

fbshipit-source-id: 756eeb6848aacaa474de4825ed4c1045d17e2cea

* Add encode/write_png functions

* Do not redefine

* Style issues correction

* Comply with low-level interface

* Minor comment correction

* Add python frontend functions

* Add encode_png test

* Pass compession level to encode_png

* Do not compare output buffers

* Convert to bytes

* Compare pil image instead of buffer

* Add error tests

* Add test_write_png

* Remove png test assets

* Register writePNG correctly

* Update write_png docstring

* Do not preserve PIL image beyond the scope
Co-authored-by: Francisco Massa <fvsmassa@gmail.com>