Support saving inc model for transformers-like api

[Kaihui-intel]

Type of Change

feature

Description

Target: Saving INC model before replace linear.
Implementation: Add parameter for_inference to from_pretrained().

Usage:

        woq_config = RtnConfig(bits=4, group_size=16)
        woq_model = AutoModelForCausalLM.from_pretrained(
            model_name_or_path,
            quantization_config=woq_config,
            for_inference=False,
        )

        # save
        output_dir = "./transformers_tmp"
        woq_model.save_pretrained(output_dir)

Expected Behavior & Potential Risk

the expected behavior that triggered by this PR

How has this PR been tested?

how to reproduce the test (including hardware information)

Dependency Change?

any library dependency introduced or removed