References are not resolved according to RFC3986

See the specification here: https://swagger.io/docs/specification/using-ref/.
This points to RFC3986 (https://tools.ietf.org/html/rfc3986) for the structure of JSON references. This RFC is not supported in openapi-diff.

I made an example of a valid reference according to OpenAPI 3, for which OpenAPI diff throws an error. See https://github.com/OpenAPITools/openapi-diff/pull/271

Example content:

openapi: 3.0.1
info:
  title: Service
  description: test
  version: test
  contact:
    name: test
    url: 'test'
servers:
  - url: 'localhost'
paths:
  /feature:
    get:
      summary: Get feature state
      operationId: feature
      description: Gets feature
      parameters:
        - name: feature
          in: query
          schema:
            $ref: '#/components/schemas/Feature/properties/feature'    # <---- this
          required: true
      responses:
        '200':
          description: Found feature
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Feature'
components:
  schemas:
    Feature:
      type: object
      properties:
        feature:
          type: string
          enum:
            - alpha
            - beta
        value:
          type: boolean
      required:
        - feature
        - value

提供された OpenAPI の例から始め、その RFC3986 リファレンスを openapi-diff の resolver の動作と比較します。リンクされた仕様と既存の pull request を確認し、プロパティリファレンスがエラーなしで受け入れられること、また既存のリファレンス処理が引き続き正しく動作することを検証します。