* Add CQRS and caching support for OrganizationIntegrations
* Use primary constructor for Delete command, per Claude suggestion
* Fix namespace
* Add XMLDoc for new commands / queries
* Remove unnecessary extra call to AddExtendedCache in Startup (call in EventIntegrationsServiceCollectionExtensions handles this instead)
* Alter strategy to use one cache / database call to retrieve all configurations for an event (including wildcards)
* Updated README documentation to reflect updated Caching doc and updated CQRS approach
