Connection status listener for NettyTcpClientTransport

[kevinherron]

Adds the ability to register a ConnectionListener with NettyTcpClientTransport that is notified when the connection is established or lost.

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modbus-tcp/src/main/java/com/digitalpetri/modbus/client/NettyTcpClientTransport.java:73

• Ensure that the behavior introduced by maybeNotifyConnectionListeners, specifically the conditions for notifying connection listeners, is covered by tests.

private void maybeNotifyConnectionListeners(State from, State to) {

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modbus-tests/src/test/java/com/digitalpetri/modbus/test/ModbusTcpClientServerIT.java:139

• Ensure the client is connected before calling client.disconnect() to avoid potential race conditions.

client.disconnect();