Move gossipsub into a separate crate (#5401)

* move gossipsub into a separate crate

* Merge branch 'unstable' of github.com:sigp/lighthouse into separate-gossipsub

* address review 2

* clippy beta

* update logging to log gossipsub logs

beacon_node/lighthouse_network/gossipsub/src/generated/compat/mod.rs

@@ -0,0 +1,2 @@
+// Automatically generated mod.rs
+pub mod pb;

beacon_node/lighthouse_network/gossipsub/src/generated/compat/pb.rs

@@ -0,0 +1,67 @@
+// Automatically generated rust module for 'compat.proto' file
+
+#![allow(non_snake_case)]
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(unused_imports)]
+#![allow(unknown_lints)]
+#![allow(clippy::all)]
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
+
+use quick_protobuf::{MessageInfo, MessageRead, MessageWrite, BytesReader, Writer, WriterBackend, Result};
+use quick_protobuf::sizeofs::*;
+use super::super::*;
+
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Debug, Default, PartialEq, Clone)]
+pub struct Message {
+    pub from: Option<Vec<u8>>,
+    pub data: Option<Vec<u8>>,
+    pub seqno: Option<Vec<u8>>,
+    pub topic_ids: Vec<String>,
+    pub signature: Option<Vec<u8>>,
+    pub key: Option<Vec<u8>>,
+}
+
+impl<'a> MessageRead<'a> for Message {
+    fn from_reader(r: &mut BytesReader, bytes: &'a [u8]) -> Result<Self> {
+        let mut msg = Self::default();
+        while !r.is_eof() {
+            match r.next_tag(bytes) {
+                Ok(10) => msg.from = Some(r.read_bytes(bytes)?.to_owned()),
+                Ok(18) => msg.data = Some(r.read_bytes(bytes)?.to_owned()),
+                Ok(26) => msg.seqno = Some(r.read_bytes(bytes)?.to_owned()),
+                Ok(34) => msg.topic_ids.push(r.read_string(bytes)?.to_owned()),
+                Ok(42) => msg.signature = Some(r.read_bytes(bytes)?.to_owned()),
+                Ok(50) => msg.key = Some(r.read_bytes(bytes)?.to_owned()),
+                Ok(t) => { r.read_unknown(bytes, t)?; }
+                Err(e) => return Err(e),
+            }
+        }
+        Ok(msg)
+    }
+}
+
+impl MessageWrite for Message {
+    fn get_size(&self) -> usize {
+        0
+        + self.from.as_ref().map_or(0, |m| 1 + sizeof_len((m).len()))
+        + self.data.as_ref().map_or(0, |m| 1 + sizeof_len((m).len()))
+        + self.seqno.as_ref().map_or(0, |m| 1 + sizeof_len((m).len()))
+        + self.topic_ids.iter().map(|s| 1 + sizeof_len((s).len())).sum::<usize>()
+        + self.signature.as_ref().map_or(0, |m| 1 + sizeof_len((m).len()))
+        + self.key.as_ref().map_or(0, |m| 1 + sizeof_len((m).len()))
+    }
+
+    fn write_message<W: WriterBackend>(&self, w: &mut Writer<W>) -> Result<()> {
+        if let Some(ref s) = self.from { w.write_with_tag(10, |w| w.write_bytes(&**s))?; }
+        if let Some(ref s) = self.data { w.write_with_tag(18, |w| w.write_bytes(&**s))?; }
+        if let Some(ref s) = self.seqno { w.write_with_tag(26, |w| w.write_bytes(&**s))?; }
+        for s in &self.topic_ids { w.write_with_tag(34, |w| w.write_string(&**s))?; }
+        if let Some(ref s) = self.signature { w.write_with_tag(42, |w| w.write_bytes(&**s))?; }
+        if let Some(ref s) = self.key { w.write_with_tag(50, |w| w.write_bytes(&**s))?; }
+        Ok(())
+    }
+}
+