Changes to Create experiment items

added the new optional request property experiment_items/items/feedback_scores/items/value_by_author/additionalProperties/author

added the new optional request property experiment_items/items/feedback_scores/items/value_by_author/additionalProperties/source_queue_id

added the new optional request property experiment_items/items/comments/items/source_queue_id

added the new optional request property experiment_items/items/feedback_scores/items/source_queue_id

added the new optional request property experiment_items/items/trace_metadata

removed the request property experiment_items/items/comments/items/source_queue_id

removed the request property experiment_items/items/feedback_scores/items/source_queue_id

removed the request property experiment_items/items/feedback_scores/items/value_by_author/additionalProperties/author

removed the request property experiment_items/items/feedback_scores/items/value_by_author/additionalProperties/source_queue_id

removed the request property experiment_items/items/trace_metadata