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* [fbsync] Bkorbar/pyavapi (#6943)

Summary:
* Test: add backend parameter

* VideoReader object now works on backend

* Frame reading now passes

* Keyframe seek now passes

* Pyav backend now supports metadata

* changes in test to reflect GPU decoder change

* Linter?

* Test GPU output

* Addressing Joao's comments

* lint

* lint

* Revert "Test GPU output"

This reverts commit f62e955d7dc81bcb23b40d58ea75413b9b62e76d.

* lint?

* lint

* lint

* Address issues in build?

* hopefully doc fix

* Arrgh

* arrgh

* fix typos

* fix input options

* remove read from memory option in pyav

* skip read from mem test for gpu and pyab be

* fix test

* remove unused import

* Hack to get reading from memory work with pyav

* patch audio test

* gallery change in a hope that docs won't break

* check video decoder inside io

* adding missing lib loading code

* remove unused input

Reviewed By: YosuaMichael

Differential Revision: D41376278

fbshipit-source-id: 1575f63a524227e69187990d88973fc50f705217
Co-authored-by: Bruno Korbar <bkorbar@quansight.com>
Co-authored-by: Joao Gomes <jdsgomes@fb.com>

* cherrypick chages made during fbsync
Co-authored-by: Joao Gomes <jdsgomes@meta.com>
Co-authored-by: Bruno Korbar <bkorbar@quansight.com>