chore: Add FDv2 data source interfaces. #157

Job	Run time
build-test-java-server-sdk-windows (3.0.0)	1m 19s
build-test-java-server-sdk-windows (2.9.0)	2m 0s
build-test-java-server-sdk-redis-store (2.9.0)	57s
build-test-java-server-sdk-redis-store (3.0.0)	1m 0s
	5m 16s

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