refactor: relocate AI SDK module to lib/sdk/server-ai (AIC-2661) #447

Job	Run time
test-packaging	4m 49s
test-contract-tests	4m 17s
test-platforms-and-versions (ubuntu-latest, 17)	3m 50s
test-platforms-and-versions (ubuntu-latest, 11)	3m 44s
test-platforms-and-versions (ubuntu-latest, 19)	3m 45s
test-platforms-and-versions (ubuntu-latest, 8)	3m 41s
	24m 6s

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