[STEP 2] refactor format and export

[n1ck-guo]

Refactored the format and export code, using format to drive export behavior and simplifying the corresponding code.

[Copilot]

Pull request overview

This PR refactors the format and export code by making the OutputFormat class an abstract base class with pack_layer and save_quantized as abstract methods. Each format subclass now implements these methods directly, eliminating the need for separate registration dictionaries (EXPORT_FORMAT and PACKING_LAYER_WITH_FORMAT). This consolidates export logic within format classes, simplifying the codebase and improving maintainability.

Key changes:

• Converted OutputFormat to an ABC with abstract methods for pack_layer and save_quantized
• Removed the export registration system (auto_round/export/register.py and related code in __init__.py)
• Refactored export functions to accept explicit parameters instead of **kwargs with dictionary unpacking
• Updated BaseCompressor.save_quantized to call format methods directly instead of using the registration dictionary

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
auto_round/formats.py	Converted OutputFormat to ABC, added abstract methods, implemented pack_layer and save_quantized in all format subclasses
auto_round/export/utils.py	Added filtering logic to remove callable and unsupported keys from quantization config
auto_round/export/register.py	Deleted entire file containing the registration dictionaries
auto_round/export/init.py	Removed all registration decorator code
auto_round/export/export_to_llmcompressor/export_to_static_fp.py	Refactored to use explicit parameters instead of kwargs unpacking
auto_round/export/export_to_llmcompressor/export_to_fp.py	Refactored to use explicit parameters instead of kwargs unpacking
auto_round/export/export_to_llmcompressor/export.py	Removed pack_layer function, refactored save_quantized to use explicit parameters
auto_round/export/export_to_itrex/export.py	Refactored to use explicit parameters and added processor/image_processor support
auto_round/export/export_to_gguf/export.py	Changed vlm parameter to mllm for consistency
auto_round/export/export_to_awq/export.py	Refactored to use explicit parameters instead of kwargs unpacking
auto_round/export/export_to_autoround/export.py	Removed conditional logic, refactored to use explicit parameters
auto_round/export/export_to_autogptq/export.py	Refactored to use explicit parameters instead of kwargs unpacking
auto_round/compressors/base.py	Refactored to call format methods directly, defined SERIALIZATION_KEYS constant
auto_round/main.py	Added --formats as an alias for --format argument

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