Support Arbitrary for `any` types

[Serhii Potapov]

Specs

• Add ArbitraryArbitrary variant to AnyDeriveTrait enum.
• Adjust to_any_derive_trait() validation function to return AnyDeriveTrait::ArbitraryArbitrary
• Add module nutype_macros/src/any/gen/traits/arbitrary.rs
• Implement there a derive of ::arbitrary::Arbitrary crate
  • If type has custom validation set with predicate = , then it should return a compile error, saying that derive of Arbitrary is not possible
  • If inner type implements Arbitrary it should work (though, it's not possible to know at the compile time if the inner type implements Arbitrary`
• Create a new example in any_arbitrary that demos derive of Arbitrary. See integer_arbitrary for example.