[GSoC] Added `DistributionType` to Experiment API #808

Job	Run time
e2e (v1.27.11, long-running-resume,from-volume-resume,median-stop)	15m 3s
e2e (v1.27.11, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	18m 2s
e2e (v1.27.11, file-metrics-collector,pytorchjob-mnist)	12m 0s
e2e (v1.27.11, median-stop-with-json-format,file-metrics-collector-with-json-format)	13m 6s
e2e (v1.28.7, long-running-resume,from-volume-resume,median-stop)	13m 59s
e2e (v1.28.7, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	18m 41s
e2e (v1.28.7, file-metrics-collector,pytorchjob-mnist)	11m 54s
e2e (v1.28.7, median-stop-with-json-format,file-metrics-collector-with-json-format)	12m 1s
e2e (v1.29.2, long-running-resume,from-volume-resume,median-stop)	15m 59s
e2e (v1.29.2, grid,bayesian-optimization,tpe,multivariate-tpe,cma-es,hyperband)	19m 51s
e2e (v1.29.2, file-metrics-collector,pytorchjob-mnist)	13m 4s
e2e (v1.29.2, median-stop-with-json-format,file-metrics-collector-with-json-format)	13m 0s
	2h 56m 40s

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