feat: full screen

[flekschas]

This PR adds the ability to open a scatter plot in full-screen mode. The full-screen mode allows to customize and up-scale a scatter plot for better exporting as PNG.

Description

What was changed in this pull request?

1. This PR adds the ability to open a scatter plot in full-screen mode. To open the full screen mode, click on the third button that features an expand icon.
2. In full-screen mode, one can open up a resize panel via the arrow button in the bottom-left corner. This panel allows to easily adjust the width/height of the scatter plot for exporting. It's now also possible to up-scale the exported image.
3. Finally, since there are more and more widget buttons now, I also added the ability to customize the control buttons. For instance, scatter.show(buttons=['full_screen', 'download', 'reset']) only shows three out of the seven buttons.

Why is it necessary?

Fixes #38
Fixes #103

Example

In the following I'm demonstrating how to enter the full-screen mode and how to customize the scatter plot's width, height, and scale for exporting the plot at 4800x3200 pixels (1200 width, 800height, 2x up-scale, and 2x device pixel ratio)

full-screen-export.mp4

Final exported image

Checklist

• Provided a concise title as a semantic commit message (e.g. "fix: correctly handle undefined properties")
• CHANGELOG.md updated
• Tests added or updated
• Documentation in API.md/README.md added or updated
• Example(s) added or updated
• Screenshot, gif, or video attached for visual changes

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