[Feature Request]: Custom Color Pallet for Selection Toolbox

### Is there an existing issue for this?

- [x] I have searched the existing issues and checked the recent builds/commits

### What would your feature do ?

I would greatly appreciate being able to choose a my own colors to show up instead of the default colors in the selection toolbox -- or just one color selection that when clicked will pop up a custom color selector tool in the same area as the toolbox close to the mouse.

### Proposed workflow

1. Go to any node
2. Press selection toolbar
3. Either a custom color pallet you can set in settings, or a custom color selector tool appears.

### Additional information

Thank you for your hard work and for your consideration. !

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-2870-Feature-Request-Custom-Color-Pallet-for-Selection-Toolbox-1ad6d73d3650819cb850d631df8d9cf2) by [Unito](https://www.unito.io)