Please add a cell toolbar example

[Ying LI]

There is a well-known example, https://github.com/jupyterlab-contrib/jlab-enhanced-cell-toolbar. It is cool, but it seems too complicated.
Can you provide a simple example, which may use '@jupyterlab/cell-toolbar'?

1. Some buttons may be available for Code cell only.
2. Some buttons may be available for Markdown cell only.
3. Some buttons may be enabled for some kind of content.

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[Jeremy Tuloup]

Thanks @MRYingLEE for the suggestion 👍

Yes having such example would be great.