Trait `Formatable` for std::format in C++20

[DarkWingMcQuack]

Would be nice to have a trait Formatable, which makes the type usable with C++20 std::format.

[Teskann]

Hi @DarkWingMcQuack, if you have a C++23 compiler, you can take a look at https://github.com/teskann/stronger-cpp, which natively supports formatting