Changes to Create New Chat Session

added the new optional request property incognito

added the new optional request property incognito_session_id

added the optional property detail/items/ctx to the response with the 422 status

added the optional property detail/items/input to the response with the 422 status

api tag public added

added the new optional request property project_id

the response property chat_session_id became required for the status 200

the response property chat_session_id became optional for the status 200

removed the request property project_id

api tag public removed