feat(gossipsub): implement partial messages extension

Implements Gossipsub Partial messages, spec is defined [here](libp2p/specs#704)

Pull-Request: #6275.

Author: jxs

protocols/gossipsub/CHANGELOG.md

@@ -21,6 +21,9 @@
 - Fix underflow when shuffling peers after prunning.
   See [PR 6183](https://github.com/libp2p/rust-libp2p/pull/6183)
 
+- Implement gossipsub 1.3 partial messages extension.
+  See [PR XXXX](https://github.com/libp2p/rust-libp2p/pull/XXXX)
+
 - Remove peer penalty for duplicate messages.
   See [PR 6112](https://github.com/libp2p/rust-libp2p/pull/6112)
 

protocols/gossipsub/Cargo.toml

@@ -13,6 +13,7 @@ categories = ["network-programming", "asynchronous"]
 [features]
 wasm-bindgen = ["getrandom/js", "futures-timer/wasm-bindgen"]
 metrics = ["prometheus-client"]
+partial_messages = []
 
 [dependencies]
 async-channel = "2.5.0"