fix(path-parameter): Support element access

[Himenon]

Summary

Support below schema.

  /get/search/{book.name}: // <--- book.name
    get:
      operationId: searchBook
      parameters:
        - in: path
          name: book.name
          required: true
          schema:
            type: string
      responses:
        200:
          description: Search Book Result
          content:
            application/json: 
              schema:
                type: object
                properties:
                  id:
                    type: number
                  bookTitle:
                    type: string

Test Plan

• https://github.com/argoproj/argo-cd/blob/master/assets/swagger.json