Add AFS and FAT32 filesystem implementations

- Introduced AFS allocation operations with bitmap management in `allocate.zig`.
- Implemented stack write operations for AFS in `stack.zig`, including record creation functions.
- Added unit write operations for AFS in `unit.zig`, enabling data writing to spans.
- Created a unified write interface for AFS in `write.zig` to streamline write operations.
- Established FAT32 constants and types in `constants.zig` and `types.zig`, respectively.
- Developed FAT32 filesystem structure in `fat32.zig`, including re-exports for common types.
- Implemented cluster operations for FAT32 in `cluster.zig`, handling cluster validation and reading.
- Added read operations for FAT32 in `read.zig`, integrating cluster and stack functionalities.
- Created entry types for FAT32 in `entry.zig`, supporting standard and long identity entries.
- Developed boot sector creation and initialization functions in `boot.zig` for FAT32.
- Implemented entry creation functions in `entry.zig` for FAT32, supporting short and long names.
- Introduced shared filesystem libraries in `fs.zig` and `shared.zig` for better modularity.
- Added mkafsdisk AFS adapter in `toolchain/mkafsdisk/afs/afs.zig` for host file I/O operations.

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