Implement field type config

[konstantinruge]

We have various field types in keeep:

enum AttributeType {
  TEXT
  NUMBER
  DATE
  CHECKBOX
  SELECT
  MULTISELECT
  URL
  EMAIL
  PHONE
  TAGS
  FILE
  SOCIAL

  @@schema("public")
}

While some of them are simple, some others hold a config JSON object that contains information on valid configurations.

For example, a select field might store the available options as config:

  {
    system: false,
    required: false,
    label: 'Status',
    type: 'SELECT',
    config: {
      options: [
        {
          label: 'New',
          value: 'new',
          color: 'gray',
        },
        {
          label: 'Contacted',
          value: 'contacted',
          color: 'blue',
        },
      ],
    },

We need to handle this properly in the backend and frontend. How? TBD