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/src/lib.rs

@@ -4474,6 +4474,9 @@ pub fn serve<T: BeaconChainTypes>(
                                 api_types::EventTopic::BlsToExecutionChange => {
                                     event_handler.subscribe_bls_to_execution_change()
                                 }
+                                api_types::EventTopic::BlockGossip => {
+                                    event_handler.subscribe_block_gossip()
+                                }
                             };
 
                             receivers.push(