feat: GenAI agent observability with server-side cost enrichment #2161

Job	Run time
Build Kafka aarch64-apple-darwin	16m 45s
Build Kafka x86_64-unknown-linux-gnu	16m 14s
Build Default aarch64-apple-darwin	16m 42s
Build Default aarch64-unknown-linux-gnu	16m 17s
Build Default x86_64-pc-windows-msvc	27m 42s
Build Default x86_64-unknown-linux-gnu	14m 22s
	1h 48m 2s

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