list_filesList files from the Moku file system
User can list files from ssd, logs and persist directories. If using the
REST API directly, these directories form the group name in the URL; e.g.
No Client Key is required (ownership doesn't need to be taken).
When using either of the clients, user can access this function directly from instrument reference.
Target directory to access
allowed values:bitstreams, logs, persist
Usage in clients,