Add a LibP2P instantiation to coordinator

It's largely unoptimized, and not yet exclusive to validators, yet has basic
sanity (using message content for ID instead of sender + index).

Fixes bugs as found. Notably, we used a time in milliseconds where the
Tributary expected  seconds.

Also has Tributary::new jump to the presumed round number. This reduces slashes
when starting new chains (whose times will be before the current time) and was
the only way I was able to observe successful confirmations given current
surrounding infrastructure.

coordinator/src/tests/tributary/sync.rs

@@ -16,8 +16,11 @@ use tributary::Tributary;
 
 use crate::{
   tributary::Transaction,
-  LocalP2p, ActiveTributary, handle_p2p, heartbeat_tributaries,
-  tests::tributary::{new_keys, new_spec, new_tributaries},
+  ActiveTributary, handle_p2p, heartbeat_tributaries,
+  tests::{
+    LocalP2p,
+    tributary::{new_keys, new_spec, new_tributaries},
+  },
 };
 
 #[tokio::test]