feat: add support for dictionary primitives

[alexstaroselsky]

What kind of change does this PR introduce? (check at least one)

• [ ] Bugfix
• [x] Feature
• [ ] Test
• [ ] Docs
• [ ] Refactor
• [ ] Build-related changes
• [ ] Other, please describe:

Description:

Add support for using primitive values with Dictionary special type. For example to represent object with any number of string keys and string values:

{
  "en": "English",
  "fr": "French"
}

Official documentation on dictionaries in OpenAPI: https://swagger.io/docs/specification/data-models/dictionaries/

While object is technically a primitive value based on TYPES in transforms/utils/validateTypes.js, users of this library will want to use typedef to represent objects.

For what it's worth, normally in JSDoc dictionary/record type objects are represented as:

Object.<string,string>

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