feat(server-ai): stamp model metadata on AI usage events #542

Job	Run time
build-test-java-server-sdk-redis-store (3.6.0)	35s
build-test-java-server-sdk-redis-store (7.1.0)	21s
build-test-java-server-sdk-windows (7.1.0)	1m 8s
build-test-java-server-sdk-windows (3.6.0)	5m 14s
build-test-java-server-sdk-redis-store (3.6.0)	50s
build-test-java-server-sdk-redis-store (7.1.0)	54s
build-test-java-server-sdk-windows (7.1.0)	1m 8s
build-test-java-server-sdk-windows (3.6.0)	5m 14s
	15m 24s

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