fix: do not resolve meta refs

[fhueser]

These changes allow for meta refs to be skipped while resolving a schema which is necessary to conform to https://json-schema.org/draft-07/schema.

{
  $id: 'schemaWithMetaRef',
  type: 'object',
  properties: {
    $ref: { type: 'string' }
  }
}

[Eomm]

Could you elaborate on this use case?

By reading the spec: https://datatracker.ietf.org/doc/html/draft-handrews-json-schema-01#section-8.3

An object schema with a "$ref" property MUST be interpreted as a
"$ref" reference. The value of the "$ref" property MUST be a URI
Reference. Resolved against the current URI base, it identifies the
URI of a schema to use. All other properties in a "$ref" object MUST
be ignored.

I understand that $ref cannot contain an object.