* [AC-1174] Introduce BulkAuthorizationHandler.cs
* [AC-1174] Introduce CollectionUserAuthorizationHandler
* [AC-1174] Add CreateForNewCollection CollectionUser requirement
* [AC-1174] Add some more details to CollectionCustomization
* [AC-1174] Formatting
* [AC-1174] Add CollectionGroupOperation.cs
* [AC-1174] Introduce CollectionGroupAuthorizationHandler.cs
* [AC-1174] Cleanup CollectionFixture customization
Implement and use re-usable extension method to support seeded Guids
* [AC-1174] Introduce WithValueFromList AutoFixtureExtensions
Modify CollectionCustomization to use multiple organization Ids for auto generated test data
* [AC-1174] Simplify CollectionUserAuthorizationHandler.cs
Modify the authorization handler to only perform authorization logic. Validation logic will need to be handled by any calling commands/controllers instead.
* [AC-1174] Introduce shared CollectionAccessAuthorizationHandlerBase
A shared base authorization handler was created for both CollectionUser and CollectionGroup resources, as they share the same underlying management authorization logic.
* [AC-1174] Update CollectionUserAuthorizationHandler and CollectionGroupAuthorizationHandler to use the new CollectionAccessAuthorizationHandlerBase class
* [AC-1174] Formatting
* [AC-1174] Cleanup typo and redundant ToList() call
* [AC-1174] Add check for provider users
* [AC-1174] Reduce nested loops
* [AC-1174] Introduce ICollectionAccess.cs
* [AC-1174] Remove individual CollectionGroup and CollectionUser auth handlers and use base class instead
* [AC-1174] Tweak unit test to fail minimally
* [AC-1174] Reorganize authorization handlers in Core project
* [AC-1174] Introduce new AddCoreAuthorizationHandlers() extension method
* [AC-1174] Move CollectionAccessAuthorizationHandler into Api project
* [AC-1174] Move CollectionFixture to Vault folder
* [AC-1174] Rename operation to CreateUpdateDelete
* [AC-1174] Require single organization for collection access authorization handler
- Add requirement that all target collections must belong to the same organization
- Simplify logic related to multiple organizations
- Update tests and helpers
- Use ToHashSet to improve lookup time
* [AC-1174] Fix null reference exception
* [AC-1174] Throw bad request exception when collections belong to different organizations
* [AC-1174] Switch to CollectionAuthorizationHandler instead of CollectionAccessAuthorizationHandler to reduce complexity
