OptionalCategoriesCategories to clear; defaults to SHARED_CACHE_WRITE_CATEGORIES.
Connection and key prefix. Pub/sub is always enabled for the clear, whatever this says.
OptionalDryCount the keys without deleting anything or notifying anyone.
OptionalIncludeAlso remove the metadata snapshot, which makes every server re-check its metadata against the
database. Defaults to true when Categories is not given (the tool default), false otherwise.
Options for ClearSharedCacheCategories.