Make clippy "happy". (#1950)

* Make clippy "happy".

Address all clippy complaints that are not purely stylistic (or even
have corner cases with false positives). Ignore all "style" and "pedantic" lints.

* Fix tests.

* Undo unnecessary API change.

protocols/gossipsub/src/config.rs

@@ -393,7 +393,7 @@ impl Default for GossipsubConfigBuilder {
                     let mut source_string = if let Some(peer_id) = message.source.as_ref() {
                         peer_id.to_base58()
                     } else {
-                        PeerId::from_bytes(&vec![0, 1, 0])
+                        PeerId::from_bytes(&[0, 1, 0])
                             .expect("Valid peer id")
                             .to_base58()
                     };