Force callers to manually provide GPTQ args (#2795)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/2795

Default values for quant are convenient, but have caused confusion.

Since there are no active users of GPTQ, we want to pre-empt potential ambiguity by making the following fields required and manually specified:
* Group Size
* Calibration Limit
* Calibration Sequence Length

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Note: Group Size's default value is untouched since it is utilized by int4 quant and has active callers

Reviewed By: mergennachin

Differential Revision: D55605859

fbshipit-source-id: 7747435b0c462d341b466659ec79eda33a9893ec