Changes to Poll incident changes with cursor paging and conditional transport

added the new optional header request parameter Accept-Encoding

added the new optional header request parameter If-None-Match

added the new optional query request parameter cursor

added the new optional query request parameter limit

added the new optional query request parameter order

the query request parameter since became optional

added the media type application/json for the response with the status 200

added the non-success response with the status 304

added the non-success response with the status 400

added the non-success response with the status 429

added the non-success response with the status 503

endpoint added