Improved JSON output

[AvitalTamir]

3 major changes:

• The JSON output generated by return clauses was previously broken, it would create a structure like this:

"d": {
  "metadata": {
    "name": [
      "foo",
      "bar",
    ]
  }
}

instead of this:

"d": [
  {
    "metadata": {
      "name": "foo"
    }
  },
  {
    "metadata": {
      "name": "bar"
    }
  }  
]

This PR fixes this issue

• Relationships are now correctly filtered on both ends, meaning resources are filtered to match the relationship pattern no matter which side of the edge they're on

• Moved the extraFilters function to the getNodeResources function so that filtering happens pre-applying relationship rules