replace tick thread with a tick callback

[AndreCostaaa]

Currently, in SLV, we use a separate thread that sleeps for 10 milliseconds before incrementing the ticks but this is messy

A possible better approach would be to set a tick callback that lvgl can use directly to know how much time has passed.

This is now possible using the clock function

[AndreCostaaa]

Current results using the lvgl benchmark with the virt64_fb_defconfig and -icount shift=0,sleep=on,align=on

Benchmark Summary (9.3.0 dev)
Name, Avg. CPU, Avg. FPS, Avg. time, render time, flush time
Empty screen, 11%, 25, 0, 0, 0
Moving wallpaper, 22%, 25, 8, 0, 8
Single rectangle, 4%, 25, 1, 0, 1
Multiple rectangles, 89%, 30, 32, 1, 31
Multiple RGB images, 11%, 25, 0, 0, 0
Multiple ARGB images, 23%, 25, 9, 0, 9
Rotated ARGB images, 94%, 23, 40, 12, 28
Multiple labels, 70%, 15, 70, 2, 68
Screen sized text, 51%, 24, 19, 17, 2
Multiple arcs, 27%, 24, 9, 6, 3
Containers, 29%, 24, 10, 7, 3
Containers with overlay, 93%, 21, 44, 41, 3
Containers with opa, 46%, 25, 16, 5, 11
Containers with opa_layer, 47%, 27, 18, 8, 10
Containers with scrolling, 26%, 25, 10, 10, 0
Widgets demo, 44%, 27, 15, 13, 2
All scenes avg.,42%, 24, 18, 7, 11