sdk: implement promptAiSdkStructured #4027

Job	Run time
build-and-check	2m 26s
test-common	30s
test-.agents	30s
test-backend	32s
test-npm-app	40s
test-integration-common	32s
test-integration-backend	32s
test-integration-cli	31s
test-integration-web	29s
test-cli	30s
test-web	1m 15s
test-integration-.agents	34s
test-integration-packages/agent-runtime	26s
test-packages/agent-runtime	42s
test-integration-npm-app	32s
	10m 41s

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