AQLM quantizer support (#28928)

* aqlm init

* calibration and dtypes

* docs

* Readme update

* is_aqlm_available

* Simpler link in docs

* Test TODO real reference

* init _import_structure fix

* AqlmConfig autodoc

* integration aqlm

* integrations in tests

* docstring fix

* legacy typing

* Less typings

* More kernels information

* Performance -> Accuracy

* correct tests

* remoced multi-gpu test

* Update docs/source/en/quantization.md

Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com>

* Update src/transformers/utils/quantization_config.py

Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>

* Brought back multi-gpu tests

* Update src/transformers/integrations/aqlm.py

Co-authored-by: Marc Sun <57196510+SunMarc@users.noreply.github.com>

* Update tests/quantization/aqlm_integration/test_aqlm.py

Co-authored-by: Marc Sun <57196510+SunMarc@users.noreply.github.com>

---------

Co-authored-by: Andrei Panferov <blacksamorez@yandex-team.ru>
Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com>
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>
Co-authored-by: Marc Sun <57196510+SunMarc@users.noreply.github.com>

src/transformers/testing_utils.py

@@ -53,6 +53,7 @@ from .integrations.deepspeed import is_deepspeed_available
 from .utils import (
     is_accelerate_available,
     is_apex_available,
+    is_aqlm_available,
     is_auto_awq_available,
     is_auto_gptq_available,
     is_bitsandbytes_available,
@@ -956,6 +957,13 @@ def require_apex(test_case):
     return unittest.skipUnless(is_apex_available(), "test requires apex")(test_case)
 
 
+def require_aqlm(test_case):
+    """
+    Decorator marking a test that requires aqlm
+    """
+    return unittest.skipUnless(is_aqlm_available(), "test requires aqlm")(test_case)
+
+
 def require_bitsandbytes(test_case):
     """
     Decorator for bits and bytes (bnb) dependency