Dmx output component for light / fan

**Describe the problem you have/What new integration you would like**
I have some max485 that I use to create dmx device for my light dmx is cool because its a bus system and require only 1 esp to control it I would really like an integration into esphome

**Please describe your use case for this integration and alternatives you've tried:**
Add a dmx platform for controlling for example fan speed or light intesity/color
may be a config could look like this :

```
light:
- platform: dmx
start_address: 0
channel_pattern: RGBW
name: "TestDMX_Light"
output: output_component1

fan:
- platform: dmx
start_address: 0
channel_pattern: D
name: "TestDMX_Fan"
output: output_component1
```

(D for dimmer) And I didn't try to use anything else for dimming the fan since I don't really like messing with high voltage

**Additional context**