Add type "object" support

[iberdinsky-skilld]

In case of grouped options object support for options may be required. It will also give ability to group them on ui side

action:
  title: Set up colors
  options:
    - name: colors
      type: object
      properties:
        - name: Brand color
          type: string
        - name: Secondary color
          type: string

https://json-schema.org/understanding-json-schema/reference/object