CORE: remaking cache Map from key AttributeHolders to Object, applying cache methods to AttributesManagerImpl

-AttributeCacheManagerImpl: remaking all methods because Map, added new methods for AttributeDefinition and key String
-ApplicationCacheTest: added tests for new methods of cache
-AttributeCacheManagerImplApi: added javadoc for new methods of cache
-AttributesManagerImpl: applied methods of cache to methods for working with DB