Super/Silky smooth syncs (#816)

* Initial block processing thread design

* Correct compilation issues

* Increase logging and request from all given peers

* Patch peer request bug

* Adds fork choice to block processing

* Adds logging for bug isolation

* Patch syncing for chains with skip-slots

* Bump block processing error logs

* Improve logging for attestation processing

* Randomize peer selection during sync

* Resuming chains restarts from local finalized slot

* Downgrades Arc batches to Rc batches

* Add clippy fixes

* Downgrade Rc<Batch> to Option<Batch> to pass processed batches to chains

* Add reviewers suggestions

beacon_node/network/src/message_processor.rs

@@ -562,9 +562,9 @@ impl<T: BeaconChainTypes> MessageProcessor<T> {
                         self.log,
                         "Processed attestation";
                         "source" => "gossip",
-                        "outcome" => format!("{:?}", outcome),
                         "peer" => format!("{:?}",peer_id),
-                        "data" => format!("{:?}", msg.data)
+                        "block_root" => format!("{}", msg.data.beacon_block_root),
+                        "slot" => format!("{}", msg.data.slot),
                     );
                 }
                 AttestationProcessingOutcome::UnknownHeadBlock { beacon_block_root } => {