add cost to sdk response #4070

Job	Run time
build-and-check	3m 0s
test-.agents	40s
test-backend	41s
test-common	46s
test-integration-.agents	41s
test-web	43s
test-integration-common	43s
test-npm-app	45s
test-cli	46s
test-packages/agent-runtime	58s
test-integration-npm-app	41s
test-integration-cli	40s
test-integration-backend	48s
test-integration-web	45s
test-integration-packages/agent-runtime	49s
	13m 26s

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