read tcp port from parsed uri instance

[gnumpi]

The TcpStream constructor currently attempts to extract the port by searching for a colon (:) in the host string. However, this host string originates from the StreamUri object, which has already parsed and split the host and port components.

As a result, the constructor fails to detect the explicitly provided port and always falls back to the default.

This PR suggests a fix by using the parsed port from the StreamUri object (if set), ensuring that the correct port is used during TcpStream initialization.

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[badaix]

Thanks!