ClassKit iOS 14.4 to 14.5 API Differences

CLSActivity.h

Added -[CLSActivity removeAllActivityItems]

CLSContext.h

Added CLSContext.navigationChildContexts

Added -[CLSContext addNavigationChildContext:]

Added -[CLSContext removeNavigationChildContext:]

CLSDataStore.h

Added -[CLSDataStore fetchActivityForURL:completion:]