Feature request: workspaces default icon

[Pyvonix]

Is your feature request related to a problem? Please describe. While configuring workspace block, it's possible to assign an icon to specific place. But doesn't look like possible to define a "default" icon for an extra workspace that will be opened/created.

Describe the solution you'd like The solution could be to add two new configuration parameters for workspaces: default and focused. These parameters will be used as default values if new workspace is created (e.g. 4, 5, 6, ...).

Example of proposed config:

{
  "end": [
    {
      "type": "workspaces",
      "name_map": {
        "1": "",
        "2": "",
        "3": ""
      },
      "favorites": ["1", "2", "3"],
      "default": "",
      "focused": "⚪",
      "all_monitors": false
    }
  ]
}

Reference of the used example: https://github.com/JakeStanger/ironbar/wiki/workspaces

Describe alternatives you've considered Currently looking through the GTK's documentation to find a possible way to assign the icon via the style.css. From my progression: the content keyword isn't supported in style.css and I don't know what will be the behavior between icons assignment inside the name_map and the stylesheet.

Additional context None.