feature: support aggregate metrics and win rate for evaluation #137

Job	Run time
collab-check	4s
wait-for-approval	4s
detect-changes	12s
integ-tests (sagemaker-train)	51m 40s
codestyle-doc-tests (sagemaker-train)	6m 14s
unit-tests (sagemaker-train)	28m 21s
	1h 26m 35s

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