feat(LEDC): Add Gamma Fade support and enhance auto channel/timer selection for multi-group #4392

Job	Run time
Generate matrix	7s
Push event file	3s
Build (validation, esp32c6) / Build validation tests for esp32c6	4m 39s
Build (validation, esp32p4) / Build validation tests for esp32p4	4m 8s
Build (validation, esp32h2) / Build validation tests for esp32h2	3m 36s
Build (validation, esp32) / Build validation tests for esp32	5m 44s
Build (validation, esp32s3) / Build validation tests for esp32s3	6m 22s
Build (validation, esp32s2) / Build validation tests for esp32s2	5m 13s
Build (validation, esp32c3) / Build validation tests for esp32c3	4m 8s
QEMU	0s
Hardware	0s
	34m 0s

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