CLI-style execution for Python-defined experiments #1751

Job	Run time
GPU Tests	13s
python 3.9 - Lint	3m 27s
python 3.9 - Type check	5m 17s
python 3.9 - Build	3m 51s
python 3.9 - Style	1m 9s
python 3.9 - Docs	4m 4s
python 3.9 - Test	4m 14s
python 3.9 - Datasets integration	1m 20s
python 3.9 - PyTorch integration	1m 38s
python 3.9 - Transformers integration	2m 39s
python 3.9 - FairScale integration	2m 10s
python 3.9 - W&B integration	3m 6s
python 3.9 - Beaker integration	50s
python 3.9 - Flax integration	5m 19s
python 3.9 - GS integration	15s
python 3.9 - Example - train_lm	4m 31s
python 3.8 - Test	4m 0s
python 3.10 - Test	4m 22s
Release	0s
	52m 25s

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