The [ROS 2 (Humble)
docs](https://docs.ros.org/en/humble/Concepts/Intermediate/About-Composition.html#writing-a-component)
recommend writing applications as components:

> By making the process layout a deploy-time decision the user can
> choose between:
>
> * running multiple nodes in separate processes with the benefits
> of process/fault isolation as well as easier debugging of individual
> nodes and
>
> * running multiple nodes in a single process with the lower overhead
> and optionally more efficient communication.

The default deployment scheme for the `web_video_server` node remains
the same: i.e., using
`ros2 run web_video_server web_video_server {parameter-args-here}`.

Having a component library available adds flexibility for users,
particularly for those users looking to use intra-process memory
for published camera topics and the web video server.

* Rename exported library
* Move cleanup_timer_ initialization to WebVideoServer constructor
* Remove setup_cleanup_inactive_streams function and references