[UDFS] Speed up directory creation by making the code that is responsible for it be asynchronous

[Zero3K20]

When I extract an archive containing 1,000 directories under a Windows 7 VM that is using the updated UDFS driver, it takes 52 seconds to do so. When doing the same under the Windows 7 that my computer is running (which is using the official UDFS driver), it takes 1 second or less to do it.