[TRANSLOG] Cut over to Path API

This commit also refactors `RAFReference` to work on top of a Channel instead of fetching the channel from the RandomAccessFile. The channel is created to truncate the file it opens too. This likely needs some documentation or we should allow the caller to pass the open options but I wanted to get this change out for review.
does this really have to be a volatile mutable property? Shouldn't we know up front, for any channel, if we want to delete on close? What uses this delete on close and can we avoid it?