fetch: add pathological packages test

Using test cases from:
https://github.com/ianprime0509/pathological-packages repository.
Depends on existence of the FAT32 file system. Folder is in FAT32 file
system because it is case insensitive and and does not support symlinks.

It is complicated test case requires internet connection, depends on
existence of FAT32 in the specific location. But it is so valuable for
development. Running `zig test Package.zig` is so much faster than
building zig binary and running `zig fetch URL`. Committing it here
although it should probably be removed.

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