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Migrates the p2p connections to Protobuf. Supersedes #4800. gogoproto's `NewDelimitedReader()` uses an internal buffer, which makes it unsuitable for reading individual messages from a shared reader (since any remaining data in the buffer will be discarded). We therefore add a new `protoio` package with an unbuffered `NewDelimitedReader()`. Additionally, the `NewDelimitedWriter()` returns the number of bytes written, and we've added `MarshalDelimited()` and `UnmarshalDelimited()`, to ease migration of existing code.
p2p
The p2p package provides an abstraction around peer-to-peer communication.
Docs:
- Connection for details on how connections and multiplexing work
- Peer for details on peer ID, handshakes, and peer exchange
- Node for details about different types of nodes and how they should work
- Pex for details on peer discovery and exchange
- Config for details on some config option