DRYD-1902: Update Strategy for AdvancedSearch Query (#478)

DRYD-1902: Update Strategy for AdvancedSearch Query (#478)

* Create DocumentModelHandler for retrieving full views for list requests
* Allow setting of DocumentModelHandler class in Resources
* Add xsd for collectionspace_core
* Update to avoid multiple CO Resource queries
* Create jaxb context for AdvancedSearch
* Replace Client pattern in AdvancedSearch
* Cleanup/removal of dead code

This is primarily to update the AdvancedSearch API in order to fetch the CollectionObjectCommon and CollectionSpaceCore documents directly without the need to call the CollectionObjectResource multiple times.