Support `ts-toolbelt` types

[eranelbaz]

Hey! We are using ts-json-schema-generator for our api validation - but looks like when running ts-json-schema-generator with https://github.com/millsp/ts-toolbelt types it generates nothing

Hope you can add support for that!

types such as -

 O.Either<
  {
    title: string;
    titleId: string;
  },
  'title' | 'titleId'
>;

Thanks