Use Gossipsub 1.1 (#1516)

## Issue Addressed

#1172

## Proposed Changes

* updates the libp2p dependency
* small adaptions based on changes in libp2p
* report not just valid messages but also invalid and distinguish between `IGNORE`d messages and `REJECT`ed messages


Co-authored-by: Age Manning <Age@AgeManning.com>

beacon_node/network/src/router/processor.rs

@@ -18,8 +18,6 @@ use types::{
     SignedAggregateAndProof, SignedBeaconBlock, SignedVoluntaryExit, Slot, SubnetId,
 };
 
-//TODO: Rate limit requests
-
 /// If a block is more than `FUTURE_SLOT_TOLERANCE` slots ahead of our slot clock, we drop it.
 /// Otherwise we queue it.
 pub(crate) const FUTURE_SLOT_TOLERANCE: u64 = 1;