add new data source type: app #488

Job	Run time
event-file	2s
build (./gradlew build -x :metadata-ingestion:build -x :metadata-ingestion:check -x docs-website:...	16m 54s
build (./gradlew build -x :metadata-ingestion:build -x :metadata-ingestion:check -x docs-website:...	12m 0s
quickstart-compose-validation	28s
build (./gradlew :datahub-frontend:build :datahub-web-react:build --parallel, UTC)	19m 17s
build (./gradlew :datahub-frontend:build :datahub-web-react:build --parallel, America/New_York)	21m 34s
Git Repo Sync	15s
build (./gradlew :metadata-ingestion-modules:airflow-plugin:build --parallel, UTC)	6m 17s
build (./gradlew :metadata-ingestion-modules:airflow-plugin:build --parallel, America/New_York)	6m 33s
	1h 23m 20s

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