A full screen option to widget

[Gecervantes01]

Problem

I would like to make any main area widget full screen.

Proposed Solution

Taken from @bollwyvl who first proposed this as an improvement:

• if Widget.fullscreenable then enable a command which...
  • calling Widget.requestFullscreen({toolbar: false}) inside a click/keyboard event handler will...
    • add class="lm-mod-fullscreen" data-lm-fullscreen-toolbar="false".

Adding an option in the context menu of the widget.

Additional context

This issue stems from comments left under issue #8710 which aims to add full screen for the entire JupyterLab application. @bollwyvl suggested that in addition to full screen for the entire interface, that there also be an option to make a specific widget full screen.

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