Changes to Get billing usage

added the new log_queries_executed enum value to the usage/items/dimension response property for the response status 200

added the new log_questions_answered enum value to the usage/items/dimension response property for the response status 200

added the new priced enum value to the usage/items/pricingStatus response property for the response status 200

added the new logs_query_bytes_scanned enum value to the usage/items/dimension response property for the response status 200

added the optional property usage/items/measurementQuality to the response with the 200 status

added the optional property usage/items/pricingStatus to the response with the 200 status

added the optional property usage/items/unavailableReason to the response with the 200 status

added the optional property usage/items/weightedQuantity to the response with the 200 status