Oats doesn't populate referenced types (just `any`)

[glinton]

When making swagger more friendly for better code generators, it was noticed that oats drops types of referenced parameters/schemas and instead defines them as any.

Given this swagger, oats generates the following typescript.

openapi: 3.0.0
info:
  title: Test API
  version: 0.0.0
servers:
  - url: ''
paths:
  /a:
    post:
      parameters:
        - in: query
          name: range
          schema:
            type: string
            enum:
              - 24h
              - 7d
              - 30d
            default: 24h
      responses:
        '200':
          description: Success
  /b:
    post:
      parameters:
        - in: query
          name: range
          schema:
            $ref: '#/components/schemas/TimeRange'
      responses:
        '200':
          description: Success
components:
  schemas:
    TimeRange:
      type: string
      enum:
        - 24h
        - 7d
        - 30d
      default: 24h

export interface PostAParams {
  query?: {
    range?: string;
  };
}

export interface PostBParams {
  query?: {
    range?: any;
  };
}