replace u8 direction field with Direction type #90
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according to https://github.com/ethereum-optimism/optimism/blob/40750a58e7a4a6f06370d18dfe6c6eab309012d9/op-node/p2p/rpc_api.go#L26C24-L26C38
implementation reference https://github.com/libp2p/go-libp2p/blob/d55bed5f78fad923353b92c7d1db64c758bcbf9c/core/network/network.go#L26