Incorrect computation of line width with multibyte characters

[echasnovski]

1. Create a file with line string.rep("ыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыыы", 10).
2. Run stylua with default config on that file. It results into multi line function call, but line width is only 70 characters, but 122 bytes.

Version: 0.14.3.

[JohnnyMorganz]

Wherever we do .len() on a string we should probably compute graphemes. Will probably need to bring in an external crate for this

[echasnovski]

Yeah... I feel you. Multibyte characters are a constant source of trouble.