Initial Interop Updates (#492)

* Add interop chain spec and rename chain_id

* Add ability to connect to raw libp2p nodes

* Adds Identify protocol, clean up RPC protocol name handling

* Update to latest libp2p, gossipsub improvements

* Updates to latest interop branch.

- Shifts decoding of objects into message handler.
- Updates to latest interop gossipsub.
- Adds interop spec constant.

* Configuration updates allow for verbosity CLI flag and spec constants

* Update submodules to master

* Correct minimal chainspec modifications

* Duplication of validator polls are no longer fatal

* Apply PR suggestions

protos/src/services.proto

@@ -45,7 +45,7 @@ service AttestationService {
 message NodeInfoResponse {
     string version = 1;
     Fork fork = 2;
-    uint32 chain_id = 3;
+    uint32 network_id = 3;
     uint64 genesis_time = 4;
     uint64 genesis_slot = 5;
 }