Changes to Create Tutorial Config

the response property modules/items/sub_steps became optional for the status 200

the response property modules/items/sub_steps/items/description became optional for the status 200

the response property modules/items/sub_steps/items/video_url became optional for the status 200

added the new optional request property modules/items/sub_steps/items/duration_seconds

added the new optional request property modules/items/sub_steps/items/poster_url

added the new optional request property modules/items/sub_steps/items/timings_url

added the new optional request property modules/items/title

the request property modules/items/sub_steps/items/description became optional

the description request property default value was added

added the optional property modules/items/sub_steps/items/duration_seconds to the response with the 200 status

added the optional property modules/items/sub_steps/items/poster_url to the response with the 200 status

added the optional property modules/items/sub_steps/items/timings_url to the response with the 200 status

added the optional property modules/items/title to the response with the 200 status

the description response's property default value was added for the status 200