chore: Add FDv2 data source interfaces. #140

Job	Run time
build-test-java-server-sdk-redis-store (2.9.0)	58s
build-test-java-server-sdk-windows (2.9.0)	4m 34s
build-test-java-server-sdk-windows (3.0.0)	1m 8s
build-test-java-server-sdk-redis-store (3.0.0)	58s
	7m 38s

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