feat(server-ai): stamp model metadata on AI usage events #583

Job	Run time
test-packaging	4m 47s
test-platforms-and-versions (ubuntu-latest, 11)	3m 52s
test-platforms-and-versions (ubuntu-latest, 8)	3m 51s
test-platforms-and-versions (ubuntu-latest, 19)	3m 42s
test-platforms-and-versions (ubuntu-latest, 17)	3m 37s
test-contract-tests	4m 25s
	24m 14s

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