Use a glob import in protobuf.rs

This removes the need to duplicate individual imports
from shared.rs and possibly forget something.

PiperOrigin-RevId: 558128872

rust/protobuf.rs

@@ -41,6 +41,4 @@ use protobuf_cpp as kernel;
 #[cfg(upb_kernel)]
 use protobuf_upb as kernel;
 
-pub use kernel::{
-    BytesMut, Mut, MutProxy, ParseError, Proxied, ProxiedWithPresence, View, ViewProxy,
-};
+pub use kernel::__public::*;

rust/shared.rs

@@ -36,9 +36,17 @@
 
 use std::fmt;
 
-pub use optional::{AbsentField, FieldEntry, Optional, PresentField};
-pub use proxied::{Mut, MutProxy, Proxied, ProxiedWithPresence, SettableValue, View, ViewProxy};
-pub use string::{BytesMut, ProtoStr};
+/// Everything in `__public` is re-exported in `protobuf.rs`.
+/// These are the items protobuf users can access directly.
+#[doc(hidden)]
+pub mod __public {
+    pub use crate::optional::{AbsentField, FieldEntry, Optional, PresentField};
+    pub use crate::proxied::{
+        Mut, MutProxy, Proxied, ProxiedWithPresence, SettableValue, View, ViewProxy,
+    };
+    pub use crate::string::{BytesMut, ProtoStr};
+}
+pub use __public::*;
 
 /// Everything in `__internal` is allowed to change without it being considered
 /// a breaking change for the protobuf library. Nothing in here should be