HG - Hardware-specific sharding test and instructions with torchrun

[rsyue]

What does this PR do? Please describe:
When more than 1 GPU present, model sharding can be tested with torchrun --nproc-per-node 8 test_hg_factory.py

Does your PR introduce any breaking changes? If yes, please list them:
None aware of

Check list:

• Was the content of this PR discussed and approved via a GitHub issue? (no need for typos or documentation improvements)
• Did you read the contributor guideline?
• Did you make sure that your PR does only one thing instead of bundling different changes together?
• Did you make sure to update the documentation with your changes? (if necessary)
• Did you write any new necessary tests?
• Did you verify new and existing tests pass locally with your changes?
• Did you update the CHANGELOG? (no need for typos, documentation, or minor internal changes)

[rsyue]

This is a PR to merge both the HuggingFace branch as well as a new hardware-specific test for sharding with multiple GPUs

[rsyue]

Module renamed to hg_qwen_omni and references updated