serde support

[nmandery]

To implement this, serde should get support for const_generics first.

• Add "const-generics" feature serde-rs/serde#1860
• Add 'core::array::from_fn' and 'core::array::try_from_fn' rust-lang/rust#75644

[nmandery]

fixed with ddc576b and 4e3c286