Deprecate the core::raw / std::raw module

It only contains the `TraitObject` struct which exposes components
of wide pointer. Pointer metadata APIs are designed to replace this:
#81513

Author: SimonSapin

library/core/src/raw.rs

@@ -1,5 +1,9 @@
 #![allow(missing_docs)]
 #![unstable(feature = "raw", issue = "27751")]
+#![rustc_deprecated(
+    since = "1.53.0",
+    reason = "use pointer metadata APIs instead https://github.com/rust-lang/rust/issues/81513"
+)]
 
 //! Contains struct definitions for the layout of compiler built-in types.
 //!

library/std/src/lib.rs

@@ -456,6 +456,7 @@ pub use core::pin;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::ptr;
 #[stable(feature = "rust1", since = "1.0.0")]
+#[allow(deprecated_in_future)]
 pub use core::raw;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::result;