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publish CameraInfo

Christian Rauch requested to merge christian-rauch/ros2_v4l2_camera:camera_info into foxy

This MR adds the CameraInfo publisher, so that intra-process communication can be used with the same CameraPublisher interface.

The node can then be used in a launch file like:

cam_node = ComposableNode(
    name='cam', namespace='/camera',
    package='v4l2_camera', plugin='v4l2_camera::V4L2Camera',
    extra_arguments=[{'use_intra_process_comms': True}])

together with the AprilTagNode in a single ComposableNodeContainer, without copies:

[camera.cam]: Image message address [PUBLISH]:	0x7ff7d4000be0
[apriltag.tag]: Image message address [SUB]:	0x7ff7d4000be0
[camera.cam]: Image message address [PUBLISH]:	0x7ff7d4001510
[apriltag.tag]: Image message address [SUB]:	0x7ff7d4001510
[camera.cam]: Image message address [PUBLISH]:	0x7ff7d4001870
[apriltag.tag]: Image message address [SUB]:	0x7ff7d4001870

Fixes #19 (closed) .

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