fix: internal root level reference do not resolve

[jonaslagoni]

This PR addresses the issue where root level references to internal schema definitions are not resolved accurately.

Fixes #201

[jonaslagoni]

So, I am not quite sure of the best cause of action to solve this issue, so might need some pointers from someone who knows the code more in-depth 😄

Trying to dereference the input in the tests the following happens:

1. First pass, the reference is being dereferenced -

   json-schema-ref-parser/lib/dereference.js

   Line 50 in f6886ab

   dereferenced = dereference$Ref(obj, path, pathFromRoot, parents, processedObjects, dereferencedCache, $refs, options);

2. Then the pointer is resolved, it says it is a circular reference (and I cant figure out whether that is incorrect behavior) and the resolved value is the root schema when I believe it should be the resolved definition schema name. -

   json-schema-ref-parser/lib/dereference.js

   Line 133 in f6886ab

   let pointer = $refs._resolve($refPath, path, options);

pointer = {
  ...,
  path: "/Users/lagoni/Documents/AsyncAPI/json-schema-ref-parser/test/specs/root-internal/root-internal.yaml#/definitions/name",
  originalPath: "/Users/lagoni/Documents/AsyncAPI/json-schema-ref-parser/test/specs/root-internal/root-internal.yaml#/definitions/name",
  value: {
    definitions: {
      name: {
        title: "name",
        type: "object",
        required: [
          "first",
          "last",
        ],
        properties: {
          first: {
            type: "string",
          },
          last: {
            $ref: "#/definitions/name/properties/first",
          },
        },
      },
    },
    $ref: "#/definitions/name",
  },
  circular: true,
  indirections: 0,
}

4. Since the pointer is marked as circular, this means that the rest of the references are not crawled, which then means the $ref within the definition is not iterated, which to me indicate that there are multiple places that need to change, but I might be wrong 😅 -

   json-schema-ref-parser/lib/dereference.js

   Line 151 in f6886ab

   if (!circular) {

But from this point on, I do not know where or what to try and poke at...

Any suggestions?

cc @philsturgeon (as you are the most recently pushed changed, feel free to re-tag someone else 😄)

[jonaslagoni]

With no interest, closing.