frame/types: re-export pub types

Re-exported the Consistency and SerialConsistency types.

Unfortunately, the util functions such as `read/write_bytes` have to be
re-exported as `pub` (instead of `pub(crate)`), since they are used
in integration tests and benchmarks. I added `#[doc(hidden)]` proc macro
for these functions so they do not appear in the documentation.

scylla/src/lib.rs

@@ -104,12 +104,18 @@ pub use macros::*;
 
 pub mod frame {
     pub use scylla_cql::frame::{
-        frame_errors, protocol_features, response, types, value, Authenticator, Compression,
+        frame_errors, protocol_features, response, value, Authenticator, Compression,
     };
     pub(crate) use scylla_cql::frame::{
         parse_response_body_extensions, read_response_frame, request, server_event_type,
         FrameParams, SerializedRequest,
     };
+
+    pub mod types {
+        #[doc(hidden)]
+        pub use scylla_cql::frame::types::*;
+        pub use scylla_cql::frame::types::{Consistency, SerialConsistency};
+    }
 }
 
 pub use scylla_cql::types::serialize;