feat: forbid most collections from containing zst elements/keys

[dj8yfo]

Part of #51 . (initially change caused by RUSTSEC-2023-0033)
Addressing review comment:

VecDeque, LinkedList, HashSet and BTreeSet have all been performing zst check during deserialization implicitly.
This pr adds corresponding checks to their serialization methods for consistency.

HashMap and BTreeMap have been performing this implicit check for (K, V) type.
A more strict check for only the key type in maps was added in the pr according to the mention in comment.

Check for arrays wasn't added, as there is a test, which asserts, that zsts are acceptable.

[dj8yfo]

I've attempted to also address the following comment from review:

i've tried

fn fail_for_zst<T>() {
    const a: usize = size_of::<T>();
    static_assertions::const_assert_ne!(a, 0);
}

but hit a compilation error

[frol]

Looks good to me!