Allow GradientAccumulationPlugin to be configured from AcceleratorConfig (#29589)

* add gradient_accumulation_kwargs to AcceleratorConfig

* add suggestions from @muellerzr to docstrings, new behavior and tests

* Documentation suggestions from @muellerz

Co-authored-by: Zach Mueller <muellerzr@gmail.com>

* addressed @muellerzr comments regarding tests and test utils

* moved accelerate version to top of file.

* @muellerzr's variable fix

Co-authored-by: Zach Mueller <muellerzr@gmail.com>

* address @amyeroberts. fix tests and docstrings

* address @amyeroberts additional suggestions

---------

Co-authored-by: Yu Chin Fabian Lim <flim@sg.ibm.com>
Co-authored-by: Zach Mueller <muellerzr@gmail.com>

src/transformers/testing_utils.py

@@ -52,6 +52,7 @@ from .integrations import (
 )
 from .integrations.deepspeed import is_deepspeed_available
 from .utils import (
+    ACCELERATE_MIN_VERSION,
     is_accelerate_available,
     is_apex_available,
     is_aqlm_available,
@@ -365,11 +366,13 @@ def require_nltk(test_case):
     return unittest.skipUnless(is_nltk_available(), "test requires NLTK")(test_case)
 
 
-def require_accelerate(test_case):
+def require_accelerate(test_case, min_version: str = ACCELERATE_MIN_VERSION):
     """
     Decorator marking a test that requires accelerate. These tests are skipped when accelerate isn't installed.
     """
-    return unittest.skipUnless(is_accelerate_available(), "test requires accelerate")(test_case)
+    return unittest.skipUnless(
+        is_accelerate_available(min_version), f"test requires accelerate version >= {min_version}"
+    )(test_case)
 
 
 def require_fsdp(test_case, min_version: str = "1.12.0"):