Feature/improve caf leds

[nrbrook]

Improved LED effects in the following ways:

• LEDs module now uses one work queue which updates all LEDs every 10ms
  (by default).
  This ensures accurate timing and smooth animations.
• Added several built-in easing functions, and ability to provide a custom
  easing function
• Added several LED effects.
• LED effects are composed with macros which makes it easier to create new
  effects.
• Defined several colors, with brightness parameters.
  Makes LED state defs more easily readable.

One issue I'm unsure about is licensing. The built-in easing functions are copied from the FastLED library. I'm not sure if that is allowed, and if so, the correct way to provide attribution.

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[pdunaj]

Hi @nrbrook , thank you for the suggestions. I don't think we will be able to add all of the changes as these seems quite invasive.
We have not been able to update this part for some time and it would be neat to improve the effects. I will try to have a look in the coming weeks.

This module was created to allow effects definition for nrf_desktop. I imagined additional effects could be defined outside of the module. Maybe there is something missing that could be added quickly and simplify app-specific animation definitions.

The built-in easing functions are copied from the FastLED library.

Thanks for letting us know.

[pdunaj]

This will need to be properly reviewed and broken down. If anything, changes should be introduced without a need to update any of the existing applications.

[nrbrook]

Thanks for the feedback.
I can certainly remove the changes to other applications and restore the original macro names so those changes are not required.

Otherwise, the changes are only limited to the LEDs module itself.

The previous implementation was not sufficient to be able to define effects with easing, and could not maintain accurate timing of effects.

[nrbrook]

Closing this PR in favour of #19904