[Inductor Cutlass backend] Development feature flag

[kadeng]

Stack from ghstack (oldest at bottom):

• #119701
• #119600
• #119009
• #119008
• #119601
• #119007
• #119598
• -> #119597
• #119006
• #119004

Introducing a feature flag for development purposes, which allows to disable the CUTLASS backend entirely.

This flag is not intended to be used by users, it is for development purposes to ensure a working codebase when features are incrementally added over the course of multiple commits / PRs and it cannot be ensured that the cutlass backend is functional in-between incremental commits.

To disable the cutlass backend, set the private variable cutlass_utils._DISABLE_CUTLASS_BACKEND to True

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @peterbell10 @ipiszy @yf225 @chenyang78 @muchulee8 @aakhundov @ColinPeppler

[pytorch-bot[bot]]

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As of commit 4c8816f39b911e7148e4e683533fadf7af0b0610 with merge base 86063b4d03a95196c25a6a346e45f9670b13cff9 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[kadeng]

Closing. The PR stack is being restructured here: https://github.com/pytorch/pytorch/pull/121492