Update on "Autoquant"

Summary: Adding autoquantization functionality, using hte do_quant api
we can test kernel speeds and pick the best quantization type (or no
quantization) for each layer.

Test Plan: python test/test.py -k "autoquant"

also tested on SAM and SDXL
pytorch-labs/segment-anything-fast#114
HDCharles/sdxl-fast@8d9942a

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Differential Revision: [D55103983](https://our.internmc.facebook.com/intern/diff/D55103983)

[ghstack-poisoned]