refactor: expand Dioptra Client to cover existing RestAPI #763

Job	Run time
build-docker-dioptra-apps (nginx)	3m 42s
build-docker-dioptra-apps (mlflow-tracking)	5m 12s
build-docker-dioptra-apps (restapi)	6m 29s
build-docker-dioptra-apps (pytorch-cpu)	14m 40s
build-docker-dioptra-apps (pytorch-gpu)	45m 44s
build-docker-dioptra-apps (tensorflow2-cpu)	15m 1s
build-docker-dioptra-apps (tensorflow2-gpu)	39m 54s
container-test (mlflow-tracking)	1m 41s
integration-test	0s
	2h 12m 23s

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