FEAT / Optim: Add GaLore optimizer (#29588)

* add galore v1

* add import

* add tests and doc

* fix doctest

* forward contrib credits from discussions

* forward contrib credits from discussions

* Apply suggestions from code review

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

* fix failing tests'

* switch to `optim_target_modules` and clarify docs

* more clarification

* enhance lookup logic

* update a test to add peak memory

* add regex, all-linear and single string support

* add layer-wise optimization through DummyOptimizers and LRSchedulers

* forward contrib credits from discussions and original idea

* add a section about DDP not supported in layerwise

* Update src/transformers/trainer.py

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

* fix self

* check only if layer_wise

* Update src/transformers/training_args.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* oops

* make use of intervals

* clarify comment

* add matching tests

* GaLoRe -> GaLore

* move to `get_scheduler`

* add note on docs

* add a warning

* adapt a bit the docs

* update docstring

* support original API

* Update docs/source/en/trainer.md

* slightly refactor

* Update docs/source/en/trainer.md

Co-authored-by: Matthew Douglas <38992547+matthewdouglas@users.noreply.github.com>

* Update src/transformers/training_args.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* fix args parsing and add tests

* remove warning for regex

* fix type hint

* add note about extra args

* make `is_regex` return optional

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Co-authored-by: Maxime <maximegmd @users.noreply.github.com>
Co-authored-by: Wing Lian <winglian @users.noreply.github.com>
Co-authored-by: Zach Mueller <muellerzr@gmail.com>
Co-authored-by: hiyouga <hiyouga@users.noreply.github.com>
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>
Co-authored-by: Matthew Douglas <38992547+matthewdouglas@users.noreply.github.com>