Creates a new directory in the vault.
This method creates a new directory in the vault at the path specified by Directory.
The value passed for Directory must be a vault-local absolute path.
The CreateParents parameter specifies whether non-existent parent directories in the specified path should be created as well. If this parameter is false, and one or more parent directories are missing, this method throws an exception.
Note: This method can only be called when Active is true, and cannot be called within events.