Changes to Get AI credit usage breakdown.

the response property breakdown became required for the status 200

the response property breakdown/items/credits became required for the status 200

the response property breakdown/items/end_user_id became required for the status 200

the response property breakdown/items/feature_type became required for the status 200

the response property total became required for the status 200

the response property total_credits_used became required for the status 200