feat(query): preserve id parameter on document if it exists

[igor-lemon]

Hi. I have an issue. I have two documents with id and without id field. In ordered collection I have an array with 2 elements. And each element of array have an id field. First document has id equals id that was in this document, second element has an id equals firestore document id. It's ok, but I can't get an id of document if document has the personal id field.
So I think good feature if you will check id exist in document and if it document has personal id field set an id of document under some different name.