[v4] Types generate singe/multi option fields with unknown

[alvarosabu]

Current behavior:

When generating the types of a component with single/multiple option fields, they are all typed as 'unknown'

Expected behavior:

It should make a union type of the string values

export interface ComponentWithOptionFields {
  single_option?: unknown;
  multi_option?: unknown;
  component: "component-with-option-fields";
  _uid: string;
  [k: string]: unknown;
}

Should be

export interface ComponentWithOptionFields {
  single_option?: 'option-a' | 'option-b';
  multi_option?: 'option-a' | 'option-b';
  component: "component-with-option-fields";
  _uid: string;
  [k: string]: unknown;
}