move fast-rewrite to agent-runtime package #3937

Job	Run time
build-and-check	2m 34s
test-.agents	35s
test-web	32s
test-integration-.agents	33s
test-packages/agent-runtime	30s
test-backend	40s
test-integration-backend	30s
test-cli	28s
test-npm-app	38s
test-common	30s
test-integration-cli	30s
test-integration-common	28s
test-integration-web	35s
test-integration-npm-app	36s
test-integration-packages/agent-runtime	37s
	10m 16s

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