Compiler: fix ref unescaping

[justdanpo]

Reference to path works incorrectly when path contains more than one slash (see example below), compiler cannot find such path:

Unhandled exception. System.InvalidOperationException: Reference path "/paths/~1xxx~1ab" not found

Also current unescaping breaks reference part into an extra level i.e. reference #/definitions~1Escape~0Characters points to Escape~Characters inside definitions while it should point to definitions/Escape~Characters in the root.

This PR fixes the issue by performing unescaping after splitting path to parts.

Example schema:

openapi: 3.0.3
info:
  title: REST API
  description: REST API description
  version: 1.0.0
servers:
  - url: http://{hostname}:{port}
    variables:
      hostname:
        default: localhost
      port:
        default: "80"

paths:
  /api/device/info:
    $ref: "#/paths/~1xxx~1ab"

  /xxx/ab:
    get:
      summary: Get information
      description: Return identifier
      responses:
        '200':
          description: info
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Info'

components:
  schemas:
    Info:
      type: object
      required:
        - id
      properties:
        id:
          type: string

[justdanpo]

@microsoft-github-policy-service agree

[Yanqiulei]

How can I resolve the following error when using Restler for testing functionality? 2024-01-24 16:39:01.091: Connection error: 'Exception: [Errno 104] Connection reset by peer'

[justdanpo]

How can I resolve the following error when using Restler for testing functionality? 2024-01-24 16:39:01.091: Connection error: 'Exception: [Errno 104] Connection reset by peer'

does that somehow relate to this pr?

[Yanqiulei]

It has nothing to do with this PR, I would like to ask for your help on how to solve this problem.