Auto merge of #5184 - matklad:delegate-debug, r=Eh2406
Auto merge of #5184 - matklad:delegate-debug, r=Eh2406

Delegate debug implementation for InternedString

Let's make `InternedString` debug implementation the same as for `String` / `str`? It's more concise, which helps when you debug printing other stuff, like `eprintln!("id = {:?}", a_package_id)`.

tsurai/cargo,eminence/cargo,rust-lang/cargo,vojtechkral/cargo,eminence/cargo,vojtechkral/cargo,tshepang/cargo,tshepang/cargo,eminence/cargo,tsurai/cargo,rustyhorde/cargo,tsurai/cargo,tsurai/cargo,nipunn1313/cargo,vojtechkral/cargo,tshepang/cargo,rustyhorde/cargo,rustyhorde/cargo,nipunn1313/cargo,tshepang/cargo,tsurai/cargo,rust-lang/cargo,eminence/cargo,nipunn1313/cargo,nipunn1313/cargo,rustyhorde/cargo,rust-lang/cargo,vojtechkral/cargo,rust-lang/cargo