connect -ip in Python controller should take a port argument

[bzbarsky-apple]

Problem

See #7800 (comment): right now the python controller can only connect to on-network devices that are running CHIP on the default CHIP_PORT, because there is no way to specify the port number when doing connect -ip.

Proposed Solution

Allow passing in a port number.

Note that this might become irrelevant once we have operational discovery set up and are discovering the port via mdns.

[stale]

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[stale]

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