[functorch] Added decomposition testing + display infra (pytorch/functorch#281)
* Added decomposition testing + display infra
* add a couple more decompositions
* changed some stuff
* made some changes
* Added decomposition testing + display infra
* add a couple more decompositions
* fix some decompositions
* changed some stuff
* updated generation
* fix test failures
* removed extraneous files
* fixed test failures
* fixed tests
* updated
* fixed tests again
