Load custom layouts from file about komorebi

[LGUG2Z]

Work on this issue has been started here: https://github.com/LGUG2Z/komorebi/tree/feature/custom-layouts

• The column is the basic building block of custom layouts
• Vertical splits in custom layouts can be arranged but not navigated, so vertical splits are disabled for now (fixing this should probably be in scope for this issue)
• Resizing support is not in scope for this issue (may be worked on in a separate issue when/if there is a user request)
• Layout flipping support is not in scope for this issue (may be worked on in a separate issue when/if there is a user request)

Anyone can now build from this branch and load custom layouts with the komorebic load-layout layout-file.json command. The complete schema for custom layout definition is here and the validation rules are here.

Example of a valid custom layout JSON file:

[
  {
    "column": "Secondary",
    "configuration": {
      "Horizontal": 3
    }
  },
  {
    "column": "Primary"
  },
  {
    "column": "Tertiary",
    "configuration": "Horizontal"
  }
]

[LGUG2Z]

Support for YAML files has also been added, example:

- column: Secondary
  configuration:
    Horizontal: 2
- column: Primary
  configuration:
    WidthPercentage: 50
- column: Tertiary
  configuration: Horizontal