Integrate the components from jupyterlab-system-monitor

[jtpio]

Problem

Currently the jupyterlab-system-monitor depends on jupyter-resource-usage but still needs to be installed separately.

It also depends on a jupyterlab-topbar package which is probably going to be abandoned after JupyterLab 4 is released.

But with JupyterLab 4 the use of the top area is going to be slightly changed. There are also new elements in the toolbar for example when RTC is enabled.

Proposed Solution

When making this extension compatible with JupyterLab 4, it will be great to also consider incorporating the UI elements from https://github.com/jtpio/jupyterlab-system-monitor:

Maybe they could be hidden hidden by default and enabled via the settings.

Additional context

Link to the extension: https://github.com/jtpio/jupyterlab-system-monitor

This might be something relevant to do before #185.

This would help fix these issues:

• Move to the jupyter-resource-usage repo jtpio/jupyterlab-system-monitor#51
• CPU Usage in JupyterLab extension #84

[jtpio]

Tagging as a "good first issue" in case someone look like to have a look at it.

It would be great to have that in jupyter-resource-usage before releasing a version for JupyterLab 4 compatibility.

Probably the work mostly involves moving code from https://github.com/jtpio/jupyterlab-system-monitor/tree/main/packages https://github.com/jupyter-server/jupyter-resource-usage/tree/main/packages/labextension, for example in multiple different plugins.