[Keymap] Update to Userspace kuchosauronad0 (#6899)

[Keymap] Update to Userspace kuchosauronad0 (#6899)

* Add Plover layer, remove unused layers

* Add rgb indicator for success/failed sequences

* Add RGB effects

* Add RGB

* Add effects for start and end of a leader sequence

* Add PLOVER layer

* Add RGB

* Add RBG

* Minor clean up

* Minor clean up

* Minor clean up

* Minor clean up

* Rename rgb_light to rgblight_user and fix all references to it

* Remove unnecessary guards

Remove unnecessary matrix_scan in rgb post_init function

* remove trailing newline