This adds support for the new FUSE performance options to the 'weed fuse' command,
matching the functionality available in 'weed mount'.
Added options:
- writebackCache: Enable FUSE writeback cache for improved write performance
- asyncDio: Enable async direct I/O for better concurrency
- cacheSymlink: Enable symlink caching to reduce metadata lookups
- sys.novncache: (macOS only) Disable vnode name caching to avoid stale data
These options can now be used with mount -t weed:
mount -t weed fuse /mnt -o "filer=localhost:8888,writebackCache=true,asyncDio=true"
This ensures feature parity between 'weed mount' and 'weed fuse' commands.