refs https://github.com/TryGhost/Toolbox/issues/384
- Adapter cache was not able to store multiple object instances derived from same Base class. This created a need to create boilerplate "shell" classes inheriting from the Base class, e.g.: ImageSizeCacheSyncInMemory etc.
- Having feature-based adapter instance caching in the adapter manager allows to simplify configuration and reuse the "base class" instead of creating artificial "shell" classes.
- For example with this change both image sizes and settings caches will create separate cache instances deriving from default "Memory" class. Less code, less configuration!
refs https://github.com/TryGhost/Toolbox/issues/384
- The syntax using a colon ":" separator has been successfully used to enable multiple adapters. The adapter manager can benefit from same convention to enable more elastic adapter cache - have multiple instances of adapters from same base class
