0.67.0: Adds a Stored Video Request Fetcher (#865)
* Adds a Stored Video Request Fetcher * Fixes two video defaults coppied from the full stored requests struct that don't exist in the slim version. * reenamble category support for OpenRTB and AMP in case use cases evolve * endpoint deps minor refactor after PR comments * Fixes inconsistencies in setting default values (old code broke setting via ENV variables) * adds some comments on stored videos * Fixes another comment * More PR comment fixes