feat: add string-width to preferred manifest

[43081j]

Adds string-width since the fast-string-width fork is much faster.

[MichaelDeBoey]

Should we add fast-string-width as an alternative of unicode-string-width as well?

[43081j]

if you mean the one by cometkim:
https://github.com/cometkim/unicode-string-width

it doesn't seem he has published it on npm (yet?)

but it does roughly a similar job to fast-string-width except it uses a custom segmenter rather than Intl. so both should probably co-exist since you won't always have Intl available