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/lighthouse_network/src/service/behaviour.rs

@@ -3,21 +3,27 @@ use crate::peer_manager::PeerManager;
 use crate::rpc::{ReqId, RPC};
 use crate::types::SnappyTransform;
 
-use libp2p::gossipsub::subscription_filter::{
-    MaxCountSubscriptionFilter, WhitelistSubscriptionFilter,
-};
-use libp2p::gossipsub::Gossipsub as BaseGossipsub;
-use libp2p::identify::Behaviour as Identify;
+use libp2p::gossipsub;
+use libp2p::identify;
 use libp2p::swarm::NetworkBehaviour;
 use types::EthSpec;
 
 use super::api_types::RequestId;
 
-pub type SubscriptionFilter = MaxCountSubscriptionFilter<WhitelistSubscriptionFilter>;
-pub type Gossipsub = BaseGossipsub<SnappyTransform, SubscriptionFilter>;
+pub type SubscriptionFilter =
+    gossipsub::MaxCountSubscriptionFilter<gossipsub::WhitelistSubscriptionFilter>;
+pub type Gossipsub = gossipsub::Behaviour<SnappyTransform, SubscriptionFilter>;
 
 #[derive(NetworkBehaviour)]
-pub(crate) struct Behaviour<AppReqId: ReqId, TSpec: EthSpec> {
+pub(crate) struct Behaviour<AppReqId, TSpec>
+where
+    AppReqId: ReqId,
+    TSpec: EthSpec,
+{
+    /// Peers banned.
+    pub banned_peers: libp2p::allow_block_list::Behaviour<libp2p::allow_block_list::BlockedPeers>,
+    /// Keep track of active and pending connections to enforce hard limits.
+    pub connection_limits: libp2p::connection_limits::Behaviour,
     /// The routing pub-sub mechanism for eth2.
     pub gossipsub: Gossipsub,
     /// The Eth2 RPC specified in the wire-0 protocol.
@@ -27,7 +33,7 @@ pub(crate) struct Behaviour<AppReqId: ReqId, TSpec: EthSpec> {
     /// Keep regular connection to peers and disconnect if absent.
     // NOTE: The id protocol is used for initial interop. This will be removed by mainnet.
     /// Provides IP addresses and peer information.
-    pub identify: Identify,
+    pub identify: identify::Behaviour,
     /// The peer manager that keeps track of peer's reputation and status.
     pub peer_manager: PeerManager<TSpec>,
 }