[ruby-core:118029] Provide utf-8 sorting for ruby next

Since it has been declared that frozen_string_literal will print warnings in Ruby 3.4. and will be mandatory in the future I must warn, that ruby still doesn't have built in method for sorting by UTF-8 characters.

Most of string methods work OK with UTF-8 strings, but not sort.

I've been using sort_alphabetical gem [ https://github.com/grosser/sort_alphabetical ] for a long time and it works good for me. Problem is that it depends on unicode_utils gem [ https://github.com/lang/unicode_utils ] which looks like a  dead repository, since repository owner has not been active for a decade.

And unicode_utils use a lot of code which is not complied with frozen_string_literal.

I am proposing to include UTF-8 sort (ex. sort_by_utf) method into next ruby version or at least include (and correct) those two gems in a future Ruby distribution.

Thanks

by 
TheR
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