* Athens: move storage.NotFound to errors.NotFound
* see where things went wrong
* empty means unexpected
* GCP: replace AlreadyExists err
* resolve conflicts
* Errors: change not found name
* fix build
* Adding a pointer registry interface
For use in storing event log pointers for 1 or more Olympus deployments
* Adding a merger strict
* Adding a storage deleter
The deleter will be used in event log delete operations
Reminder: delete operations will be exceptional (i.e. security
vulnerabilities)
* Adding a reference to a deleter in the merger
* adding docs to the event log merger
* adding docs to the event log pointer registry
* Adding an ErrNotFound error to the CDN package
* Adding a CDN deleter
* Adding more docs
* Making the merger use CDN actions only
* Removing the CDN type
It's not used anywhere
* Starting to build the merger
* remove out-of-scope changes
They'll be added as appropriate in follow-ups
