🚨🚨🚨 [Refactor] Move third-party related utility files into integrations/ folder 🚨🚨🚨 (#25599)

* move deepspeed to `lib_integrations.deepspeed`

* more refactor

* oops

* fix slow tests

* Fix docs

* fix docs

* addess feedback

* address feedback

* final modifs for PEFT

* fixup

* ok now

* trigger CI

* trigger CI again

* Update docs/source/en/main_classes/deepspeed.md

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* import from `integrations`

* address feedback

* revert removal of `deepspeed` module

* revert removal of `deepspeed` module

* fix conflicts

* ooops

* oops

* add deprecation warning

* place it on the top

* put `FutureWarning`

* fix conflicts with not_doctested.txt

* add back `bitsandbytes` module with a depr warning

* fix

* fix

* fixup

* oops

* fix doctests

---------

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

examples/research_projects/wav2vec2/test_wav2vec2_deepspeed.py

@@ -32,7 +32,7 @@ from copy import deepcopy  # noqa
 
 from parameterized import parameterized  # noqa
 from transformers import TrainingArguments, is_torch_available  # noqa
-from transformers.deepspeed import is_deepspeed_available  # noqa
+from transformers.integrations.deepspeed import is_deepspeed_available  # noqa
 from transformers.file_utils import WEIGHTS_NAME  # noqa
 from transformers.testing_utils import (  # noqa
     CaptureLogger,