Add an example of a compressed DMA frame buffer

[Dominaezzz]

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Pull Request Details 📖

Description

Depends on #2191 and #2237.

This example is to showcase what users can do with the DmaTxBuffer trait.
I've added a "compressed frame buffer" (names hard) which shrinks the space/memory required to store a full solid frame buffer for a 320 * 480 screen, from 307,200 bytes down to just 3,840 bytes. You don't even need PSRAM anymore (Of course for more complex images, just using PSRAM for the full frame buffer would be the better choice).

This example is for I8080 but no reason SPI screens can't use this as well.
It is also particularly useful for #2081, where screens don't typically have a frame buffer and chunking is not possible.

The last commit contains the actual changes.

Testing

Ran the example on my devkit.

[bugadani]

This is fun. I don't see much practical use (I only mean for the example demonstrating sending out single color frames or repeating tiles of essentially random size), and for an example you could just hard-code the values IMO, but linking the same buffer multiple times is a good idea and has practical benefits for sure.

[Dominaezzz]

and for an example you could just hard-code the values IMO

Fair, can do.
I left them in just in case someone wanted to try different screen sizes but anyone can figure out the numbers if they want to.

(I'll update once all the dependent PRs have landed)

[Dominaezzz]

Instead of the I8080 example, I'll do it for the RGB driver's example, and probably add the buffer to the hal directly.