Add status_led package: network, API, error and OTA status on a visible RGB light

Red blink without network, orange without an API client, purple on a
component error, blue blink during OTA, green when things are back to
normal, then the light returns to its previous state.

echo uses it on the gateway LED ring; drop its status_led on GPIO23,
which never worked because the ledc output owns that pin.

mcu-echo.yaml

@@ -5,7 +5,7 @@
 #   GPIO19                             -> speaker_bus (i2s_audio i2s_bclk_pin)
 #   GPIO21  Gateway LED ring red       -> led_red (output ledc)
 #   GPIO22                             -> speaker_id (speaker i2s_audio i2s_dout_pin)
-#   GPIO23  Gateway LED ring blue      -> led_status (light status_led); led_blue (output ledc)
+#   GPIO23  Gateway LED ring blue      -> led_blue (output ledc)
 #   GPIO25  Gateway LED ring green     -> led_green (output ledc)
 #   GPIO26  Grove SDA                  -> i2c (i2c sda)
 #   GPIO27  ATOM onboard RGB LED (inside, not visible)
@@ -33,6 +33,10 @@ esp32:
 packages:
   common: !include common/common.yaml
   ipv6_only: !include common/ipv6_only.yaml
+  status_led: !include
+    file: common/status_led.yaml
+    vars:
+      light_id: led_light
 
 external_components:
   # speaker media player: skip a failed playlist item (esphome#19862), drop once merged
@@ -90,11 +94,6 @@ light:
     red: led_red
     green: led_green
     blue: led_blue
-  - platform: status_led
-    id: led_status
-    pin:
-      number: 23
-      allow_other_uses: true
 
 output:
   - platform: ledc
@@ -105,9 +104,7 @@ output:
     pin: 25
   - platform: ledc
     id: led_blue
-    pin:
-      number: 23
-      allow_other_uses: true
+    pin: 23
 
 i2s_audio:
   - id: speaker_bus