schedulers/aws_batch: add a scheduler to launch jobs directly on aws_batch

[d4l3k]

This adds a scheduler that allows for launching TorchX jobs directly on AWS Batch. This requires almost no infrastructure setup (just UI) and provided a fairly sane docker job engine.

Test plan:

scripts/awsbatchint.sh
pytest torchx/schedulers/test/aws_batch_scheduler_test.py
pyre

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[codecov]

Codecov Report

Merging #381 (9fadde0) into main (4b989d5) will decrease coverage by 0.45%.
The diff coverage is 85.02%.

@@            Coverage Diff             @@
##             main     #381      +/-   ##
==========================================
- Coverage   94.70%   94.24%   -0.46%     
==========================================
  Files          63       64       +1     
  Lines        3359     3526     +167     
==========================================
+ Hits         3181     3323     +142     
- Misses        178      203      +25     

Impacted Files	Coverage Δ
torchx/schedulers/aws_batch_scheduler.py	84.93% <84.93%> (ø)
torchx/schedulers/__init__.py	96.66% <100.00%> (+0.11%)	⬆️

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