Add sourcemap (#345) #3889

Job	Run time
build-and-check	2m 29s
test-backend	44s
test-.agents	35s
test-common	38s
test-cli	38s
test-integration-web	37s
test-web	32s
test-npm-app	40s
test-integration-cli	34s
test-integration-packages/agent-runtime	37s
test-integration-.agents	31s
test-packages/agent-runtime	30s
test-integration-backend	39s
test-integration-common	39s
test-integration-npm-app	39s
	11m 2s

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