Add block_gossip Beacon API events (#5864)

* Add bls event

* Update events and types

* Add bls in event

* Event bls

* tests..rs

* change order

* another tests.rs

* Signed BLS

* Revert "another tests.rs"

This reverts commit 7f54e9c1ce.

* Revert "Signed BLS"

This reverts commit 1146bc734b.

* withdrawal_keyparis

* Fix genesis

* block gossip

* Add definition for BlockGossip

* Fix block gossip

* Tests.rs

* Update block and events

* Add bls event

* Event bls

* tests..rs

* change order

* another tests.rs

* Signed BLS

* Revert "another tests.rs"

This reverts commit 7f54e9c1ce.

* Revert "Signed BLS"

This reverts commit 1146bc734b.

* block gossip

* Add definition for BlockGossip

* Fix block gossip

* Tests.rs

* Update block and events

* Merge branch 'BeaconAPI-events-block-gossip' of https://github.com/chong-he/lighthouse into BeaconAPI-events-block-gossip

* Remove tests

* Tests.rs

* Tests.rs

* Tests.rs

* Tests similar to block event

* Update common/eth2/src/types.rs

Co-authored-by: Michael Sproul <micsproul@gmail.com>

* Merge remote-tracking branch 'origin/unstable' into BeaconAPI-events-block-gossip

* Fix tests

beacon_node/http_api/tests/tests.rs

@@ -5461,6 +5461,7 @@ impl ApiTester {
             EventTopic::Attestation,
             EventTopic::VoluntaryExit,
             EventTopic::Block,
+            EventTopic::BlockGossip,
             EventTopic::Head,
             EventTopic::FinalizedCheckpoint,
             EventTopic::AttesterSlashing,
@@ -5576,10 +5577,20 @@ impl ApiTester {
             .await
             .unwrap();
 
-        let block_events = poll_events(&mut events_future, 3, Duration::from_millis(10000)).await;
+        let expected_gossip = EventKind::BlockGossip(Box::new(BlockGossip {
+            slot: next_slot,
+            block: block_root,
+        }));
+
+        let block_events = poll_events(&mut events_future, 4, Duration::from_millis(10000)).await;
         assert_eq!(
             block_events.as_slice(),
-            &[expected_block, expected_head, expected_finalized]
+            &[
+                expected_gossip,
+                expected_block,
+                expected_head,
+                expected_finalized
+            ]
         );
 
         // Test a reorg event