getObject and getArray in JsonStructureParser do not advance parser state

Based on JSON-P description for getObject and getArray methods, they should return the current object or array and advance to the next value, but currently, JsonStructureParser only returns the current object or array

Locate JsonStructureParser and inspect getObject and getArray first, comparing their behavior with the JSON-P description. Verify that each method returns the current object or array and advances to the next value, then run the parser's relevant tests or add coverage for both methods.

Written by the indexing model from the issue text.