Filter camera by USB port id

[doisyg]

Start with the why:

For multiple cameras systems in production, it becomes quickly complex to manage a long list of camera serial numbers (current filter with i_mx_id). An alternative could be to filter by USB port id as it is done classically for cameras in ROS, see for instance usb_port_id in https://github.com/IntelRealSense/realsense-ros

Move to the what:

Add a parameter usb_port_id to depthai_ros_driver::Camera for the driver to open only the camera plugged to the corresponding port

Move to the how:

@mattmacleod

it would mean quite a few changes to depthai-core as well to expose USB bus information in the Device class

[Serafadam]

Thanks for that request, this shouldn't be a big issue to add it 👍

[Serafadam]

Added in #229, available on v2.6.3