[Bug libstdc++/109162] C++23 improvements to std::format

[tkaminsk at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109162

--- Comment #22 from Tomasz Kamiński <tkaminsk at gcc dot gnu.org> ---
> That is highly intentional to fix incorrect formatting when the container is 
> a string. See https://cplusplus.github.io/LWG/issue3881

I am well aware of this quirk, but my implementation uses range_formatter<char>
in this case, and also produce sequence of characters, instead of string
presentation.
See corresponding test case:
```
// Sequence output is always used
std::queue<_CharT, std::basic_string<_CharT>> qs(
            std::from_range,
            std::basic_string_view<_CharT>(WIDEN("321")));

          res = std::format(WIDEN("{}"), qs);
          VERIFY( res == WIDEN("['3', '2', '1']") );
```

So I still see no reason to using formatter<ref_view<R>> over range_formatter.