[draft] stateful dataloader and sampler

[edward-io]

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Summary:

Test plan:

Fixes #{issue number}

[codecov[bot]]

Codecov Report

Merging #190 (8b3e66e) into master (0feb0c1) will increase coverage by 0.32%. The diff coverage is 93.86%.

:exclamation: Current head 8b3e66e differs from pull request most recent head 3dd469a. Consider uploading reports for the commit 3dd469a to get more accurate results

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage   86.46%   86.79%   +0.32%     
==========================================
  Files          61       64       +3     
  Lines        3391     3543     +152     
==========================================
+ Hits         2932     3075     +143     
- Misses        459      468       +9     

Impacted Files	Coverage Δ
torchtnt/utils/distributed.py	69.03% <25.00%> (-2.59%)	:arrow_down:
torchtnt/data/samplers.py	90.47% <90.47%> (ø)
tests/data/conftest.py	100.00% <100.00%> (ø)
tests/data/test_multi_dataloader.py	99.48% <100.00%> (ø)
tests/data/test_stateful_dataloader.py	100.00% <100.00%> (ø)
torchtnt/data/__init__.py	100.00% <100.00%> (ø)
torchtnt/data/dataloaders.py	100.00% <100.00%> (ø)

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