[DRAFT: Do not merge] feature: enable SMDDP for Pytorch DDP distribution

[vishwakaria]

Issue #, if available:

Description of changes:

Testing done:

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[codecov-commenter]

Codecov Report

Merging #3355 (e69538d) into master (fe604ff) will decrease coverage by 0.83%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3355      +/-   ##
==========================================
- Coverage   90.02%   89.18%   -0.84%     
==========================================
  Files         868      204     -664     
  Lines       76828    19004   -57824     
==========================================
- Hits        69161    16949   -52212     
+ Misses       7667     2055    -5612     

Impacted Files	Coverage Δ
src/sagemaker/fw_utils.py	91.76% <100.00%> (ø)
src/sagemaker/pytorch/estimator.py	100.00% <100.00%> (ø)
...9/site-packages/sagemaker/drift_check_baselines.py
...hon3.8/site-packages/sagemaker/lineage/__init__.py
...-packages/sagemaker/debugger/profiler_constants.py
...s/sagemaker/tensorflow/training_compiler/config.py
...ackages/sagemaker/async_inference/waiter_config.py
.../python3.9/site-packages/sagemaker/rl/estimator.py
...ges/sagemaker/model_monitor/data_capture_config.py
.../sagemaker/huggingface/training_compiler/config.py
... and 1064 more

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[vishwakaria]

Closed in favor of #3490.