feat(display): Remove display task to instead have lvgl handle it directly

[abrondijk]

Description

This change removes the update task entirely from the display component, as lvgl can now retrieve its own task ticks.

It also sets the delay callback, so that it can actually delay, rather than doing this.
This should be much more efficient.

Potential downside is that the pause and resume functions can no longer do anything.
The user could still "pause" lvgl by not calling lv_timer_handler().

Motivation and Context

General performance improvements. On programs that actually have a lot of tasks running, the delay callback should free up quite some cpu time.

How has this been tested?

Tested on the Lilygo T-Encoder-Pro and Smartknob-HA.

Screenshots (if appropriate, e.g. schematic, board, console logs, lab pictures):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Hardware (schematic, board, system design) change
• Software change

Checklist:

• My change requires a change to the documentation.
• I have added / updated the documentation related to this change via either README or WIKI

Software

• I have added tests to cover my changes.
• I have updated the .github/workflows/build.yml file to add my new test to the automated cloud build github action.
• All new and existing tests passed.
• My code follows the code style of this project.

Hardware

• I have updated the design files (schematic, board, libraries).
• I have attached the PDFs of the SCH / BRD to this PR
• I have updated the design output (GERBER, BOM) files.

[github-actions]

✅Static analysis result - no issues found! ✅

[finger563]

I've tested this locally within the esp-box-emu project, and simply calling the existing gui.pause() and menu.pause() (which we had to anyway) is sufficient to allow direct rendering of emulator to screen for direct mode. Can still easily switch back and forth between lvgl and emulator so this works well in my testing 🚀

Please fix the broken examples, then I think this will be good.