Quantization: Add AutoClip Pass

[jambayk]

Describe your changes

• Add AutoClip pass which conducts an automatic search for optimal clipping values for linear layers that will be quantized later.
• Based on BitDistiller paper.
• Model quality metrics will be provided in a follow up paper which adds the self-distillation part of the paper.
• Gptq pass and quant_utils refactored to share common code. These will also be useful later when adding AWQ pass which is similar to autoclip but does symmetric clipping and also optimizes scales.

Checklist before requesting a review

• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
• Lint and apply fixes to your code by running lintrunner -a
• Is this a user-facing change? If yes, give a description of this change to be included in the release notes.

(Optional) Issue link