Update master branch to LVGL v9 version

[PGNetHun]

• Update LVGL to v9-rc version, commit: lvgl/lvgl@09cb87c
• Fix gen_mpy.py binding script
• Amend MicroPython files and examples to the new LVGL namings (for example: img -> image, btn -> button)
• Update README.md: rename Micropython -> MicroPython
• Remove lv.COLOR_FORMAT.NATIVE_REVERSED, and use instead lv_draw_sw_rgb565_swap() function for some displays
• Remove lv.COLOR_DEPTH from display drivers and examples
• Modify ili9XXX.py: change class attributes to instance attributes (-> eliminate "singleton" class attributes)
• Modify ili9XXX.py: set explicit default color formats instead of lv.COLOR_FORMAT.NATIVE
• Modify MicroPython display drivers (ili9XXX.py and st77xx.py) and examples to use new display draw buffer approach (related PR: refactor(display): use draw_buf_t for display lvgl#5204)
• Update examples to align to LVGL changes
• Disable LVGL log (by default)
• Merge master changes into PR branch

[PGNetHun]

@kisvegabor , @XuNeo , @kdschlosser ,
Could you please review & approve this big PR?
I don't want to add any more commits to it, so it is ready to merge to master branch.
After this, every new PRs should target master.
(and prepare the work to upgrade MicroPython to v1.22)

PS: this PR is tested on M5Core2 ESP32 device, and it works

[kisvegabor]

I'm not super confident, but as far as I can tell it's ok 🙂

[PGNetHun]

Reminder: disable LV_USE_ARABIC_PERSIAN_CHARS
see: lvgl/lvgl#5386

UPDATE: it is already disabled

[PGNetHun]

To have a linear and clean git history on master branch, use "Squash and merge"

[kisvegabor]

@PGNetHun feel free to merge it when it feels appropriate.

[XuNeo]

I can only review part of the code. It looks good to me.