migrates prototype/mixed_precision to configs

[vkuzo]

Summary:

Note: had to remove int4/int8 functionality to simplify the refactor.
Whoever uses this script next and needs that functionality can add this
back.

Test Plan:

pytest test/prototype/test_mixed_precision.py -s -x

Reviewers:

Subscribers:

Tasks:

Tags:

[vkuzo]

Stack from ghstack (oldest at bottom):

• migrate prototype codebook quant to configs #1858
• migrate nf4 to configs #1857
• migrate sparsify_ to configs #1856
• migrate prototype/quantized_training to configs #1855
• -> migrates prototype/mixed_precision to configs #1854

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/1854

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[drisspg]

Imo these prototype folders we should just break BC

[vkuzo]

I agree, but it's actually easier to keep BC here (to not change callsites) - if someone wants to change the callsites of all these prototype features, that would sgtm in a separate PR.

[drisspg]

I guess, but also changing callsites within a repro is - I find - not that hard and ultimately helps create a more unified api as we move everything to configs + registrations

[vkuzo]

ok will do

[vkuzo]

@drisspg , I take it back. See how the scope of #1851 expanded from removing the bc name. Some of these other prototypes have even more callsites throughout the codebase, some of those callsites aren't easily testable, etc - I just don't think it's worth the effort to tie removing old names to this PR stack since we have to keep BC anyways for some of the APIs.

[drisspg]

See comment