Make light.addressable_set color parameters behave as documented & consistent with elsewhere (#2009)

esphome/components/light/automation.cpp

@@ -0,0 +1,15 @@
+#include "automation.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace light {
+
+static const char *const TAG = "light.automation";
+
+void addressableset_warn_about_scale(const char *field) {
+  ESP_LOGW(TAG, "Lambda for parameter %s of light.addressable_set should return values in range 0-1 instead of 0-255.",
+           field);
+}
+
+}  // namespace light
+}  // namespace esphome