Support of undici to make request to subgraph along with make-fetch-happen

[ujjawal-khare]

Undici support should be there since it's more performant as compared to make-fetch-happen,

Benchmarks for undici are given in following link: https://www.npmjs.com/package/undici

[glasser]

undici should work as a fetcher now. In fact with #1805 we are explicitly switching fetcher to a TypeScript interface which we're explicitly testing matches undici's TypeScript declarations.

That said, while undici is a powerful and flexible HTTP library, its fetch implementation is a lot less flexible — it doesn't let you use any of undici's customizations directly. For example, there is no support for proxies with undici's fetch. So unless we were to rewrite RemoteGraphQLDataSource to use undici's native API directly (which stops you from using any other implementation) we would lose proxy support.

(One could write a separate UndiciGraphQLDataSource that uses the native Undici API too...)