az-pagination-response must check allOf when looking for response schema properties

[mikekistler]

The pagination-response function currently only checks for the value and nextLink properties in the properties object of the response schema. But these properties could be defined in the children of an allOf in the response schema, so the code will need to nest down into the allOf to find the properties it is looking for.

And this will be complicated because it will also have to keep track of where it found those properties so it can set the paths correctly in any error messages that are issued.