Add support for ASIF

A new virtual disk format available in macOS Tahoe.

Does not look like there is any public documentation about the format (yet), so will probably require reverse engineering.

References:
- https://eclecticlight.co/2025/06/12/macos-tahoe-brings-a-new-disk-image-format/
- https://developer.apple.com/documentation/virtualization/vzdiskimagestoragedeviceattachment/