sdk: extract metadata for generateObject and generateText #4111

Job	Run time
build-and-check	3m 1s
test-integration-.agents	42s
test-integration-common	40s
test-integration-cli	49s
test-integration-packages/agent-runtime	49s
test-.agents	43s
test-integration-backend	43s
test-integration-npm-app	42s
test-cli	55s
test-backend	45s
test-integration-web	48s
test-packages/agent-runtime	51s
test-common	44s
test-npm-app	54s
test-web	43s
	13m 49s

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