feat(router): enable starting the router without subgraphs#1533

df-wg merged 19 commits intomainwundergraph/cosmo:mainfrom

dave/eng-5954-it-should-be-possible-to-run-the-router-without-subgraphswundergraph/cosmo:dave/eng-5954-it-should-be-possible-to-run-the-router-without-subgraphsCopy head branch name to clipboard