Migrate state dict API to DSD

[mori360]

Migrate state dict API to DSD:

• load_from_full_model_state_dict -> set_model_state_dict
• get_full_model_state_dict -> get_model_state_dict
• load_from_full_optimizer_state_dict -> set_optimizer_state_dict
• get_full_optimizer_state_dict -> get_optimizer_state_dict

What is the purpose of this PR? Is it to

• [ ] add a new feature
• [ ] fix a bug
• [ ] update tests and/or documentation
• [ ] other (please add here)

Please link to any issues this PR addresses.

Changelog

What are the changes made in this PR? *

Test plan

Please make sure to do each of the following if applicable to your PR. If you're unsure about any one of these just ask and we will happily help. We also have a contributing page for some guidance on contributing.

• [ ] run pre-commit hooks and linters (make sure you've first installed via pre-commit install)
• [ ] add unit tests for any new functionality
• [ ] update docstrings for any new or updated methods or classes
• [ ] run unit tests via pytest tests
• [ ] run recipe tests via pytest tests -m integration_test
• [ ] manually run any new or modified recipes with sufficient proof of correctness
• [ ] include relevant commands and any other artifacts in this summary (pastes of loss curves, eval results, etc.)

UX

If your function changed a public API, please add a dummy example of what the user experience will look like when calling it. Here is a docstring example and a tutorial example

• [ ] I did not change any public API
• [ ] I have added an example to docs or docstrings

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/1930

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:x: 1 New Failure, 2 Cancelled Jobs

As of commit 1ad30263c317e03a10c497d996e7490f603a9aad with merge base 7bfb3336446f0d874ab5d4595249839b735b7076 ():

NEW FAILURE - The following job has failed:

* [GPU tests / gpu_test (3.11, stable)](https://hud.pytorch.org/pr/pytorch/torchtune/1930#32728741376) ([gh](https://github.com/pytorch/torchtune/actions/runs/11747237995/job/32728741376)) `tests/torchtune/training/test_distributed.py::TestFullyShardState::test_qlora_state_dict`

CANCELLED JOBS - The following jobs were cancelled. Please retry:

* [GPU tests / gpu_test (3.10, stable)](https://hud.pytorch.org/pr/pytorch/torchtune/1930#32728740056) ([gh](https://github.com/pytorch/torchtune/actions/runs/11747237995/job/32728740056)) `tests/torchtune/training/test_distributed.py::TestFullyShardState::test_qlora_state_dict` * [GPU tests / gpu_test (3.9, stable)](https://hud.pytorch.org/pr/pytorch/torchtune/1930#32728739344) ([gh](https://github.com/pytorch/torchtune/actions/runs/11747237995/job/32728739344)) `##[error]The operation was canceled.`

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[ebsmothers]

Hi @mori360 I missed this one until now. Can you share more context on this PR?