- Add FUSE kernel module with connection management, device node, and filesystem
implementation
- Implement FUSE protocol handling for basic operations (lookup, read, write,
create, etc.)
- Add /dev/fuse device support with ioctl for connection cloning
- Support FUSE mount options (allow_other, default_permissions, etc.)
- Add permission model support (DAC and remote modes)
- Add userspace test programs (fuse_demo and fuse3_demo)
- Add comprehensive test suite for FUSE functionality
- Update VFS to support FUSE-specific features and permission handling
Signed-off-by: longjin <longjin@DragonOS.org>
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