feature: python module support to torch_distributed

[clumsy]

Issue #, if available:
Related to aws/sagemaker-training-toolkit#205

Description of changes:

torch_distributed uses torchrun which supports running python modules via -m <MODULE>. Currently SageMaker limits torch_distributed to scripts only. This change will allow submitting the training jobs with sagemaker_program="-m <MODULE>"

Testing done:
Successfully submitted the SageMaker training job with the right parameterss.

The training job will still fail in runtime because sagemaker-training-toolkit need to be updated:

Traceback (most recent call last):
  File "/opt/conda/lib/python3.9/site-packages/sagemaker_training/trainer.py", line 88, in train
    entrypoint()
  File "/opt/conda/lib/python3.9/site-packages/sagemaker_pytorch_container/training.py", line 171, in main
    train(environment.Environment())
  File "/opt/conda/lib/python3.9/site-packages/sagemaker_pytorch_container/training.py", line 101, in train
    entry_point.run(uri=training_environment.module_dir,
  File "/opt/conda/lib/python3.9/site-packages/sagemaker_training/entry_point.py", line 93, in run
    install(name=user_entry_point, path=environment.code_dir, capture_error=capture_error)
  File "/opt/conda/lib/python3.9/site-packages/sagemaker_training/entry_point.py", line 126, in install
    os.chmod(os.path.join(path, name), 511)

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[rahul003]

Have we tested end to end with both toolkit changes and this? Let's make sure toolkit changes are released first

[clumsy]

Hi @rahul003, I was able to confirm the fixes work, you're right we need to release toolkit changes first. Thanks!

[liujiaorr]

/Bot run all

[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: 749cd30
• Result: FAILED
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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-slow-tests
• Commit ID: 749cd30
• Result: FAILED
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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: 749cd30
• Result: FAILED
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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: 749cd30
• Result: SUCCEEDED
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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 749cd30
• Result: FAILED
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