move handler-function-type into agent-runtime #3883

Job	Run time
build-and-check	2m 32s
test-integration-.agents	37s
test-integration-backend	38s
test-integration-npm-app	33s
test-integration-cli	35s
test-integration-packages/agent-runtime	38s
test-integration-common	30s
test-integration-web	33s
test-common	37s
test-backend	41s
test-.agents	35s
test-web	35s
test-cli	32s
test-npm-app	43s
test-packages/agent-runtime	32s
	10m 51s

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