Support for showing pictures

[Walther]

It would be nice if Helix could display images, where desired.

Use cases for this could include for example (but not limited to)

• viewing programmatically generated graphics in the editor, while editing the code
• previewing image assets when finding, inserting, and using filenames
• creating a pixel-based output buffer for future plugins to draw on, for richer output experience

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There is a strong contender for a possible standard terminal graphics protocol: https://sw.kovidgoyal.net/kitty/graphics-protocol/

In the Kitty terminal, you can use kitty icat image.png to view an image directly in the terminal. In addition, the page lists 15 other applications and 9 libraries currently utilizing (and exposing) the protocol.

This is also not limited to Kitty:

Other terminals that have implemented the graphics protocol:

• Konsole
• wayst
• WezTerm

Other options for implementing this could potentially exist, too, but they might be behind in the adoption curve.

[kirawi]

See #6938