Fullwidth unicode characters should be accounted for in print width

[belav]

Unicode characters can be fullwidth, which takes the same space as two normal characters. This isn't taken into account when printing right now. A method was abstracted away to /Src/CSharpier/Utilities/StringExtensions.cs that can be modified to implement this feature.

See https://github.com/prettier/prettier/blob/main/src/utils/get-string-width.js for how prettier does it.

There doesn't seem to be much about this that I can find in c#/.net
https://stackoverflow.com/questions/65410411/how-to-reliably-determine-the-width-of-a-character-in-c