chore: refactor speaker & handshaker into actors

[ethanndickson]

Instead of relying on class inheritance, the new Speaker can composed into whatever would like to speak the CoderVPN protocol, and messages can be handled by iterating over the speaker itself e.g:

enum IncomingMessage {
    case message(RecvMsg)
    case RPC(RPCRequest<SendMsg, RecvMsg>)
}

for try await msg in speaker {
    switch msg {
    case let .message(msg):
        // Handle message that doesn't require a response
    case let .RPC(req):
        // Handle incoming RPC
    }
}

[ethanndickson]

• chore: refactor speaker & handshaker into actors #15 👈 (View in Graphite)
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[ethanndickson]

Merge activity

• Jan 6, 1:39 AM EST: A user started a stack merge that includes this pull request via Graphite.
• Jan 6, 1:39 AM EST: A user merged this pull request with Graphite.