feature: 事件&单节点执行&流程重演&流程回滚 #268

Job	Run time
engine-lint / flake8_and_black (3.6)	13s
pipeline-lint / flake8_and_black (3.6)	22s
engine-lint / flake8_and_black (3.7)	10s
pipeline-lint / flake8_and_black (3.7)	23s
engine-unittest / Python 3.6	49s
engine-unittest / Python 3.7	46s
pipeline-unittest / build (3.6, 2.2)	1m 36s
pipeline-unittest / build (3.6, 3)	1m 43s
pipeline-unittest / build (3.7, 2.2)	1m 30s
pipeline-unittest / build (3.7, 3)	1m 37s
runtime-pipeline-intergration-test / build (3.6, 2.2)	9m 9s
runtime-pipeline-intergration-test / build (3.6, 3)	9m 9s
pipeline-intergration-test / build (3.6, 2.2)	6m 31s
runtime-pipeline-intergration-test / build (3.7, 2.2)	9m 2s
pipeline-intergration-test / build (3.6, 3)	6m 20s
runtime-pipeline-intergration-test / build (3.7, 3)	9m 4s
pipeline-intergration-test / build (3.7, 2.2)	6m 19s
pipeline-intergration-test / build (3.7, 3)	6m 20s
	1h 11m 3s

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