wil::zwstring_view needs a formatter

[jonwis]

Saying this:

wil::zwstring_view v{L"foo, bar"};
auto m = std::format(L"{}", v);

Produces the usual inscrutable "you can't format that but I won't explain why" thing. Using v.c_str() works fine. Presumably that's because there's no std::formatter<wil::zwstring_view> alike, and we need to provide something like this from the STL's __msvc_formatter.hpp:

template <_Format_supported_charT _CharT, class _Traits>
struct formatter<basic_string_view<_CharT, _Traits>, _CharT>
    : _Formatter_base<basic_string_view<_CharT, _Traits>, _CharT, _Basic_format_arg_type::_String_type> {
#if _HAS_CXX23
    constexpr void set_debug_format() noexcept {
        this->_Set_debug_format();
    }
#endif // _HAS_CXX23
};

[dunhor]

I wonder if simple inheritance would work since zstring_view derives from basic_string_view