Add test vector in ssz library

> @gballet any idea why this would happen? hashes_of_zero might not be sufficiently generated?
>
> the gut feeling says this because Kai choose a genesis so far back that is slot `13436859` currently and this would have filled some slices in the state quite a lot (so basically around 13436859 items in a slice)
>
> @GrapeBaBa can you add a test vector in ssz library for i) slice ii) array iii) List of such a size for lets say u8 type (bytes) and see ifs serialization/deserialization/merkelization passes

_Originally posted by @g11tech in [#178](https://github.com/blockblaz/zeam/issues/178#issuecomment-3289717709)_