Changes to Get Cost Period Comparison

added the optional property items/items/compute_spends to the response with the 200 status

added the optional property items/items/storage_spends to the response with the 200 status

the query request parameter order_by was restricted to a list of enum values

the query request parameter order_direction was restricted to a list of enum values

added the new enum value asc to the query request parameter order_direction

added the new enum value cost to the query request parameter order_by

added the new enum value desc to the query request parameter order_direction

added the new enum value percentage_change_from_previous_period to the query request parameter order_by

added the new enum value percentage_spend to the query request parameter order_by