Move rgba.toColor to channels.toColor #495

Job	Run time
lint	55s
test-api-parallel (18, ubuntu, chromium)	2m 28s
test-unit-parallel (18, ubuntu)	1m 28s
test-api-parallel (18, ubuntu, firefox)	2m 50s
test-unit-parallel (18, macos)	1m 40s
test-playwright-parallel (18, ubuntu, chromium)	2m 1s
test-unit-parallel (18, windows)	7m 23s
test-playwright-parallel (18, ubuntu, firefox)	1m 46s
test-playwright-parallel (18, ubuntu, webkit)	2m 1s
build	1m 0s
test-unit-coverage	56s
release-dry-run (18)	1m 48s
test-api (18, windows, chromium)	5m 39s
test-unit (18, ubuntu)	55s
test-api (18, windows, firefox)	6m 20s
test-unit (18, macos)	1m 31s
test-unit (18, windows)	6m 44s
	47m 25s

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