upgrade to libp2p 0.52 (#4431)

## Issue Addressed

Upgrade libp2p to v0.52

## Proposed Changes
- **Workflows**: remove installation of `protoc`
- **Book**: remove installation of `protoc`
- **`Dockerfile`s and `cross`**: remove custom base `Dockerfile` for cross since it's no longer needed. Remove `protoc` from remaining `Dockerfiles`s
- **Upgrade `discv5` to `v0.3.1`:** we have some cool stuff in there: no longer needs `protoc` and faster ip updates on cold start
- **Upgrade `prometheus` to `0.21.0`**, now it no longer needs encoding checks
- **things that look like refactors:** bunch of api types were renamed and need to be accessed in a different (clearer) way
- **Lighthouse network**
	- connection limits is now a behaviour
	- banned peers no longer exist on the swarm level, but at the behaviour level
	- `connection_event_buffer_size` now is handled per connection with a buffer size of 4
	- `mplex` is deprecated and was removed
	- rpc handler now logs the peer to which it belongs

## Additional Info

Tried to keep as much behaviour unchanged as possible. However, there is a great deal of improvements we can do _after_ this upgrade:
- Smart connection limits: Connection limits have been checked only based on numbers, we can now use information about the incoming peer to decide if we want it
- More powerful peer management: Dial attempts from other behaviours can be rejected early
- Incoming connections can be rejected early
- Banning can be returned exclusively to the peer management: We should not get connections to banned peers anymore making use of this
- TCP Nat updates: We might be able to take advantage of confirmed external addresses to check out tcp ports/ips


Co-authored-by: Age Manning <Age@AgeManning.com>
Co-authored-by: Akihito Nakano <sora.akatsuki@gmail.com>

beacon_node/http_api/src/test_utils.rs

@@ -9,12 +9,9 @@ use directory::DEFAULT_ROOT_DIR;
 use eth2::{BeaconNodeHttpClient, Timeouts};
 use lighthouse_network::{
     discv5::enr::{CombinedKey, EnrBuilder},
-    libp2p::{
-        core::connection::ConnectionId,
-        swarm::{
-            behaviour::{ConnectionEstablished, FromSwarm},
-            NetworkBehaviour,
-        },
+    libp2p::swarm::{
+        behaviour::{ConnectionEstablished, FromSwarm},
+        ConnectionId, NetworkBehaviour,
     },
     rpc::methods::{MetaData, MetaDataV2},
     types::{EnrAttestationBitfield, EnrSyncCommitteeBitfield, SyncState},
@@ -170,7 +167,7 @@ pub async fn create_api_server_on_port<T: BeaconChainTypes>(
         local_addr: EXTERNAL_ADDR.parse().unwrap(),
         send_back_addr: EXTERNAL_ADDR.parse().unwrap(),
     };
-    let connection_id = ConnectionId::new(1);
+    let connection_id = ConnectionId::new_unchecked(1);
     pm.on_swarm_event(FromSwarm::ConnectionEstablished(ConnectionEstablished {
         peer_id,
         connection_id,