Changes to Create topic subscriptions

the subscriberIds request property's minItems was increased to 1

the subscriptions request property's minItems was increased to 1

the data/items/preferences/items/workflow response's property type changed from no type to object for status 201

the data/items/subscriber response's property type changed from no type to object for status 201

added the optional property data/items/topic/allOf[#/components/schemas/TopicDto]/data to the response with the 201 status