Support exploded query string arrays

[ntotten]

We should support exploded format of query strings in both the docs and the playground.

openapi: 3.0.0
info:
  title: Comma-Separated Query Parameters Example
  version: 1.0.0
paths:
  /example:
    get:
      summary: Example endpoint
      parameters:
        - name: items
          in: query
          description: Comma-separated list of items
          required: false
          style: form
          explode: false
          schema:
            type: array
            items:
              type: string
      responses:
        '200':
          description: Success

• style: form: Indicates that the query parameter is serialized as form data.
• explode: false: Specifies that the array values should be serialized as a single comma-separated string (e.g., items=one,two,three).
• schema with type: array: Defines that the parameter is an array, with items specifying the type of each value (in this case, string).

For a request to this API, the query string would look like:

GET /example?items=one,two,three

The server will parse items as an array: ['one', 'two', 'three'].