[boschshc] Support smart light bulbs (#13725)

* [boschshc] Support smart light bulbs (#13707)

* add thing type definition for smart bulbs using system channels
* add constants for thing type and channels
* implement and register handler
* implement binary switch service (to switch on/off)
* implement multi-level switch service (allows to get/set brightness
from 0-100%)
* implement service to get and set colors
* add unit tests for handler and state classes
- update documentation

Signed-off-by: David Pace <dev@davidpace.de>

bundles/org.openhab.binding.boschshc/README.md

@@ -16,6 +16,7 @@ Binding for the Bosch Smart Home.
     - [Security Camera 360](#security-camera-360)
     - [Security Camera Eyes](#security-camera-eyes)
     - [Intrusion Detection System](#intrusion-detection-system)
+    - [Smart Bulb](#smart-bulb)
   - [Limitations](#limitations)
   - [Discovery](#discovery)
   - [Bridge Configuration](#bridge-configuration)
@@ -178,6 +179,18 @@ Allows to retrieve notifications in case of intrusions. The system can be armed
 | disarm-action                | Switch               | ☑  | Disarms the intrusion detection system when an ON command is received. |
 | mute-action                  | Switch               | ☑  | Mutes the alarm when an ON command is received. |
 
+### Smart Bulb
+
+A smart bulb connected to the bridge via Zigbee such as a Ledvance Smart+ bulb.
+
+**Thing Type ID**: `smart-bulb`
+
+| Channel Type ID | Item Type | Writable | Description                                                    |
+| ----------------| --------- | :------: | -------------------------------------------------------------- |
+| power-switch    | Switch    | ☑  | Switches the light on or off.                                  |
+| brightness      | Dimmer    | ☑  | Regulates the brightness on a percentage scale from 0 to 100%. |
+| color           | Color     | ☑  | The color of the emitted light.                                |
+
 ## Limitations
 
 - Discovery of Things