[WIP] display: Add support for `AIP31068` based displays

[bazarovdev]

Adds support for YHCB2004 display used in Geeetech A10/M/T printers. The display is based on AIP31068 controller and uses 9-bit SPI commands. The details were found in Marlin FW that supports this display (see https://github.com/MarlinFirmware/Marlin/issues/25196).

This PR depends on merging of https://github.com/Klipper3d/klipper/pull/6633 to enable 9-bit SPI.

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[bazarovdev]

Added padding to 8 commands and sending them as 9 byte sequence (as proposed in PR below) It eliminates need to change SW SPI driver (https://github.com/Klipper3d/klipper/pull/6633)

Tested on YHCB2004 display of Geeetech A10M:

[bazarovdev]

Self review:

Free of defects: adds new dispaly driver. Attached image from testing on YHCB2004 display. Impact: gives option to integrate support to Geeetech A10/M/T, ender clones with mixing extruders (M=2in1out, T=3in1out) increasing user base of Klipper and potentially helping test features related to mixing. (Currently, most users stuck with Marlin or mainly replace stock board+display to work with Klipper. The facebook group of owners contains 6.3k users). Licensing: 1 file introduced with GNU GPLv3 licensing, commit signed-off. Guidelines: Tried to follow to my best understanding. Docs: PR contains update to docs related usage of new driver (same as hd44780_spi) Commits: 1 commit with 1 feature.

[bazarovdev]

@KevinOConnor Thanks for review, commited fixes, but feel free to edit if it is still not in needed style.

If merged, will prepare printer config for submission. Thanks, Alex

[KevinOConnor]

Okay thanks. I was able to merge this. Unfortunately, github did something weird and the commit message got lost. Sorry about that.

-Kevin

[bazarovdev]

Thanks, I don't see what is got lost, so never mind.

my first PR to Klipper got merged :tada: 1 year from idea->fixed on christmas holidays->rewritten to avoid sw_spi changes->approved->merged. A metric for me to work on :chart_with_upwards_trend: :)