Allow templates to be defined clusterwide and persisted

Currently it's only possible to define a cache configuration locally at runtime. It should be possible to define a configuration template clusterwide. Furthermore, if an overlay storage is utilised the defined configurations should be stored in a configs.xml file.

A CACHE_CONFIG_SCOPE needs to be added to the GlobalConfigurationManagerImpl, with the cache listener updated to handle the scope. The LocalConfigurationStorage also needs updating to allow templates to be stored and persisted.