Azure Cognitive Search Samples client library for Java

Use Latest PagedFlux Changes from Azure Core (#8303)

* Update PagedFlux usage to use new changes from Azure Core

* Use custom PagedFlux implementation in Azure Search to support pages with additional metadata

* Updated PagedFlux usage in Azure Search to allow search to use its non-String continuation token

* Update paging to new guidelines

* Fixed sample and test code

* Added missing documentation

* Remove unused dependency

* Add logic to handle when Azure Resource Group isn't set

* Changes based on PR feedback

* Moved PagedResponse classes into util

* Fix constructor scoping issue