feat: commonizes several FDv2 related types in Server #326

Job	Run time
build-test-java-server-sdk-redis-store (3.6.0)	48s
build-test-java-server-sdk-redis-store (7.1.0)	59s
build-test-java-server-sdk-windows (7.1.0)	1m 26s
build-test-java-server-sdk-windows (3.6.0)	1m 10s
	4m 23s

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