sdk: implement fetchAgentFromDatabase #3992

Job	Run time
build-and-check	2m 27s
test-integration-npm-app	36s
test-integration-backend	32s
test-integration-web	38s
test-.agents	32s
test-integration-common	32s
test-integration-packages/agent-runtime	30s
test-backend	1m 21s
test-integration-cli	37s
test-cli	37s
test-integration-.agents	31s
test-web	32s
test-npm-app	40s
test-common	38s
test-packages/agent-runtime	49s
	11m 32s

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