Changes to Answer on callback

for the query request parameter callback_id, the minLength was increased from 0 to 1

added the pattern ^(?!\s*$).+ to the query request parameter callback_id

added the new optional request property message/allOf[#/components/schemas/NewMessageBody]/format

added share discriminator mapping keys to the message/allOf[#/components/schemas/NewMessageBody]/attachments/items request property

removed the request property message/allOf[#/components/schemas/NewMessageBody]/attachment

removed the request property user_id