fix: support column with Unicode comment

[ota42y]

When we crete column with Unicode comment, annotate gem does not update that annotation.

\w means a word character([a-zA-Z0-9_]) and it does not match Unicode leteers. https://docs.ruby-lang.org/en/3.0.0/Regexp.html

Now column_pattern in annotante_one_file support ascii characters only and doesn't match column with unicode comment. So the columns will disappear from old_columns and new_columns.

https://github.com/ctran/annotate_models/blob/786394947c041f781df2ee0ea003e09452fa9dba/lib/annotate/annotate_models.rb#L378-L380

Even if we change that column (i.e. nullable to not null), annotate_one_file's check ignore that column so annotation doesn't update. (The first time create it, it works, and the column annotation is left out of date)

So I fix column_pattern support Unicode letter.

[ota42y]

I fixed rubocop warning and these test failed occurred in develop branch so I think this change is no problem.