Support max_line_length from editor config

[mateuszlewko]

This is a feature request for supporting max_line_length property from the .editorconfig file.

Currently this is not enforced in any way. max_line_length property determines line length and should enforce wrapping lines that exceed max_line_length characters.

[filipw]

This is tracked by dotnet/roslyn#15406
OmniSharp uses .editorconfig implementation from the Roslyn repo.

Once it's implemented there, it will work in OmniSharp too.

[filipw]

I will close this as duplicate - we already have one issue like this for OmniSharp in OmniSharp/omnisharp-roslyn#1478