feat(client,server): remove tcp feature and code (#2929)

This removes the `tcp` feature from hyper's `Cargo.toml`, and the code it enabled:

- `HttpConnector`
- `GaiResolver`
- `AddrStream`

And parts of `Client` and `Server` that used those types. Alternatives will be available in the `hyper-util` crate.

Closes #2856 
Co-authored-by: MrGunflame <mrgunflame@protonmail.com>

Cargo.toml

@@ -94,12 +94,6 @@ server = []
 
 # Tokio support
 runtime = [
-    "tcp",
-    "tokio/rt",
-    "tokio/time",
-]
-tcp = [
-    "socket2",
     "tokio/net",
     "tokio/rt",
     "tokio/time",