frame: re-export ProtocolFeatures

Integration tests make use of
scylla_cql::frame::protocol_features::ProtocolFeatures.
This struct needs to be pub re-exported, but we hide it in the docs.

scylla/src/lib.rs

@@ -103,9 +103,7 @@ pub mod macros;
 pub use macros::*;
 
 pub mod frame {
-    pub use scylla_cql::frame::{
-        frame_errors, protocol_features, value, Authenticator, Compression,
-    };
+    pub use scylla_cql::frame::{frame_errors, value, Authenticator, Compression};
     pub(crate) use scylla_cql::frame::{
         parse_response_body_extensions, read_response_frame, request, server_event_type,
         FrameParams, SerializedRequest,
@@ -128,6 +126,11 @@ pub mod frame {
             };
         }
     }
+
+    #[doc(hidden)]
+    pub mod protocol_features {
+        pub use scylla_cql::frame::protocol_features::ProtocolFeatures;
+    }
 }
 
 pub use scylla_cql::types::serialize;