Add effect range to rgblight.c (#5856)

Add effect range to rgblight.c (#5856)

* add rgblight_set_effect_range()

* implement effect range

* Arrange the order of function list in rgblight.h .

* update docs/feature_rgblight.md

* fix RGBLIGHT_RAINBOW_SWIRL_RANGE default value

* add example code about Utility Functions

* add example code about direct operation functions

* When RGBLIGHT_SPLIT is defined, the following function has no meaning and is invalidated.

 * rgblight_setrgb_master(r, g, b)
 * rgblight_setrgb_slave(r, g, b)
 * rgblight_sethsv_master(h, s, v)
 * rgblight_sethsv_slave(h, s, v)

* add temporary test code for rgblight_set_effect_range

* fix rgblight_effect_knight() bug

* Test End. Revert "add temporary test code for rgblight_set_effect_range"

This reverts commit 5680cddd012d68b2db75a532862a7fef250f8973.