Enterprise merge demo branch

[JacksonKearl]

This contains the changes from #2914, #2911, #2915, and #2933 all rolled into one branch for testing things out and experiemnting with APIs and whatnot.

I'll be making more changes to those PR's as suggested, so this branch will probably go stale quick ans should not be the branch that ends up being merged.

const { ApolloServer } = require("apollo-server");
const { ApolloGateway } = require("@apollo/gateway");

const gateway = new ApolloGateway({
  apiKey: "blah:blah:32423",
  tag: "staging"
});

(async () => {
  const server = new ApolloServer({gateway: await gateway.load()}); // apiKey and tag are threaded through
  server.listen().then(({ url }) => {
    console.log(`🚀 Server ready at ${url}`);
  });
})();

[jbaxleyiii]

@JacksonKearl this is so awesome! I'll review it more this afternoon but 🎉