create handleSlashCommands router #4256

Job	Run time
build-and-check	3m 8s
test-common	56s
test-cli	1m 11s
test-packages/internal	52s
test-backend	57s
test-packages/billing	57s
test-integration-.agents	53s
test-packages/agent-runtime	1m 2s
test-.agents	51s
test-integration-cli	57s
test-web	53s
test-integration-common	1m 4s
test-integration-npm-app	1m 2s
test-integration-web	55s
test-integration-packages/agent-runtime	1m 4s
test-integration-packages/billing	57s
test-integration-packages/internal	56s
test-integration-backend	1m 6s
test-npm-app	1m 0s
	20m 41s

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