Widget: Colour Picker

### Description

Adds a colour picker to the dashboard, with interactive colour palette, and raw text input for hex or RGB values.

### Properties

Existing Dashboard 1.0 Options:

### Events

- **on-change**: this widget would need to send a message back to Node-RED when it's value is changed

### Controls

- **enabled**: this widget can be enabled/disabled

### Existing Examples

Vuetify Component: https://vuetifyjs.com/en/components/color-pickers/

The existing Dashboard 1.0 picker is a lot more compact though, so may need some level of customisation on top.

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate