Some Spectral Rules for spec v3 should run after resolving references

[smoya]

Describe the bug

Both asyncapi3-required-operation-channel-unambiguity and asyncapi3-required-channel-servers-unambiguity rules (found here) apply at this moment to the unresolved document, meaning they run when the JSON References ($ref) are not yet resolved.

That was made in this way because it simplifies a lot the logic; we just need to match a pattern to the JSON pointer and voilà!.
However, that simplicity has a cost.
This validation works perfectly when any of the references found in channel.servers or operation.channel point to the same file.
However, if any point to an external file, the validation might not work as expected. See the next section where you will find an example that illustrate this.

How to Reproduce

# a.yaml
asyncapi: 3.0.0
info:
  title: FileA
  version: 1.0.0
channels:
  test:
    $ref: './b.yaml#/channels/test'

# b.yaml
asyncapi: 3.0.0
info:
  title: FileB
  version: 1.0.0
channels:
  test: 
    servers:
      - $ref: '#/components/servers/serverA' # Invalid document. Servers of a channel defined in the root channels object should point to root servers object as well.
components:
  servers:
    serverA:
      host: localhost
      protocol: http

b.yaml is an invalid document, as explained in the comment of the yaml file. And the parser shows that error when that document is validated.
However, a.yaml, which is referencing an invalid channel from b.yaml file, won't fail validation.

The reason is that the validation is made by matching that the JSON pointer references to the root object. I.e. for operation.channel, the pointer should contain the #/channels/ literal.

Expected behavior

The a.yaml located in the previous example should be considered as invalid by the parser.
I think the only way to achieve this is to make the rules pass when the document is unresolved.

cc @fmvilas @jonaslagoni @derberg

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