Rename hyper 1.0 to hyper and hyper 0.14 to hyper0 (#9254)

Follow-up of #9234 to give hyper 1.0 the version-free name, and the
legacy version of hyper the one with the version number inside. As we
move away from hyper 0.14, we can remove the `hyper0` name piece by
piece.

Part of #9255

proxy/src/lib.rs

@@ -90,6 +90,8 @@ use tokio::task::JoinError;
 use tokio_util::sync::CancellationToken;
 use tracing::warn;
 
+extern crate hyper0 as hyper;
+
 pub mod auth;
 pub mod cache;
 pub mod cancellation;