fix: public cbor/json codec module

follow-up to #5792

configuring a request_response behavior with generic codec does not allow for setting request/response size limits.

e.g. the following fails to compile since `request_response::cbor::codec` is private:
```rust
let non_default_codec = request_response::cbor::codec::Codec::<CustomRequest, CustomLargeResponse>::default()
.set_response_size_maximum(large_response_size_max);
let request_response = request_response::Behaviour::with_codec(
non_default_codec,
std::iter::once((
StreamProtocol::new("/request-response/1"),
request_response::ProtocolSupport::Full,
)),
request_response::Config::default(),
);
```

Pull-Request: #5830.

Author: mosure

Cargo.lock

@@ -96,7 +96,7 @@ libp2p-pnet = { version = "0.26.0", path = "transports/pnet" }
 libp2p-quic = { version = "0.12.0", path = "transports/quic" }
 libp2p-relay = { version = "0.19.1", path = "protocols/relay" }
 libp2p-rendezvous = { version = "0.16.0", path = "protocols/rendezvous" }
-libp2p-request-response = { version = "0.28.0", path = "protocols/request-response" }
+libp2p-request-response = { version = "0.28.1", path = "protocols/request-response" }
 libp2p-server = { version = "0.12.6", path = "misc/server" }
 libp2p-stream = { version = "0.3.0-alpha", path = "protocols/stream" }
 libp2p-swarm = { version = "0.46.0", path = "swarm" }

Cargo.toml

@@ -1,3 +1,8 @@
+## 0.28.1
+
+- fix: public cbor/json codec module
+  See [PR 5830](https://github.com/libp2p/rust-libp2p/pull/5830).
+
 ## 0.28.0
 
 - Deprecate `void` crate.

protocols/request-response/CHANGELOG.md

@@ -3,7 +3,7 @@ name = "libp2p-request-response"
 edition = "2021"
 rust-version = { workspace = true }
 description = "Generic Request/Response Protocols"
-version = "0.28.0"
+version = "0.28.1"
 authors = ["Parity Technologies <[email protected]>"]
 license = "MIT"
 repository = "https://github.com/libp2p/rust-libp2p"

protocols/request-response/Cargo.toml

@@ -46,7 +46,7 @@
 /// ```
 pub type Behaviour<Req, Resp> = crate::Behaviour<codec::Codec<Req, Resp>>;
 
-mod codec {
+pub mod codec {
     use std::{collections::TryReserveError, convert::Infallible, io, marker::PhantomData};
 
     use async_trait::async_trait;

protocols/request-response/src/cbor.rs

@@ -46,7 +46,7 @@
 /// ```
 pub type Behaviour<Req, Resp> = crate::Behaviour<codec::Codec<Req, Resp>>;
 
-mod codec {
+pub mod codec {
     use std::{io, marker::PhantomData};
 
     use async_trait::async_trait;