feat/parsec: add related_info to Observation::Genesis

- Some dot files had to be modified/regenerated because the hash of `Observation::Genesis` changed.
- A bogus clippy lint silenced by slightly reshuffling the code (clippy issue: rust-lang/rust-clippy#4133)

Author: madadam

examples/basic.rs

@@ -107,7 +107,12 @@ impl Peer {
     fn from_genesis(our_id: PeerId, genesis_group: &BTreeSet<PeerId>) -> Self {
         Self {
             id: our_id.clone(),
-            parsec: Parsec::from_genesis(our_id, genesis_group, ConsensusMode::Supermajority),
+            parsec: Parsec::from_genesis(
+                our_id,
+                genesis_group,
+                vec![],
+                ConsensusMode::Supermajority,
+            ),
             observations: vec![],
             blocks: vec![],
         }

input_graphs/benches/minimal.dot

@@ -914,7 +914,7 @@ digraph GossipGraph {
 
 /// ===== meta-elections =====
 /// consensus_history:
-/// a137c1b54c5895b13a1e204869f650636920286bd5b903e0576a9a15a2f58c2c
+/// d98f8abc4ba966aadc391bb857a6879a122602074766f19fadf22ce59dd0410e
 /// c93ff2cda7e9dd6a49b12c4fccdbaa0fe1b25b1e92421f288b06bfe53122be0f
 
 /// interesting_events: {