Non-Default QoS settings for usb_cam_node

[nsk126]

I want to ask if it would be better if a non-default QoS profile would be better for Image publishers. Current publishers in the master branch have the Default Qos Profile with a depth of 100.

usb_cam/src/usb_cam_node.cpp

Line 49 in 1091c5b

rclcpp::QoS {100}.get_rmw_qos_profile()))),

usb_cam/src/usb_cam_node.cpp

Lines 186 to 189 in 1091c5b

	std::string(BASE_TOPIC_NAME) + "/compressed", rclcpp::QoS(100));
	m_compressed_cam_info_publisher =
	this->create_publisher<sensor_msgs::msg::CameraInfo>(
	"camera_info", rclcpp::QoS(100));

Ideas:

• I think a lower depth would be better in some cases.
• For the same reason, I would like to make the QoS profile configurable.
• Or enable qos_override in the rlcpp node.

If reasonable, I can make a PR.