net, refactor: Privatise CNode send queue #27407
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The send queue members on
CNode
should not be part of the public interface. This PR makes all of them private and creates a clear interface for the send queue.The interface after this PR consists of:
CNode::PushMessage
for appending a message onto the send queueCNode::SocketSendData
for pushing as many messages from the send queue as possible onto the wireCNode::IsSendQueueEmpty
for checking if the send queue is emptyCNode::TestOnlyClearSendQueue
a test-only utility for clearing the send queue)