Add color picker to config in vscode

[SnowSquire]

added "format": "color-hex" so that a color picker appears in vscode

[SnowSquire]

For the next release docs/komorebi.example.json also needs to be updated to use the latest schema, that task should probably be automated as well but idk how that would work. Maybe komorebi would fill in "$schema" on install/update?

[LGUG2Z]

This file is automatically generated so we'll need to look at how to do this with either schemars or serde annotations on the root config struct