Interop Lock-in

[mkalinin]

This is a meta-issue for the things planned to be done prior or during the Interop Lock-in event:

• Spec v0.8.3 Spec v0.8.3 #165
• Integrate libp2p Feature/libp2p integration #183
• Disseminate blocks and attestations Feature/libp2p integration #183
• Verify block signatures
• Drop bad actors
• Discovery v5 client Discovery v5  #189
• Metrics Initial metrics implementation. #178
• Mocked start Feature/mocked start #177
• Revamp attestation pool [WIP] Attestation pool take 1: interop #176
• Feed sync with copy of data FeedSync tool initial implementation. #185
• Feel graffitti with debug info

[mkalinin]

Closing in favor of #202, #203, #204, #189, #176