sdk: implement getUserFromApiKey #3989

Job	Run time
build-and-check	2m 30s
test-common	31s
test-cli	32s
test-backend	35s
test-npm-app	35s
test-.agents	33s
test-integration-common	39s
test-integration-.agents	30s
test-packages/agent-runtime	41s
test-integration-npm-app	34s
test-integration-backend	34s
test-integration-packages/agent-runtime	37s
test-integration-cli	37s
test-integration-web	37s
test-web	36s
	10m 41s

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