docs: add detailed Roslyn LS server and CLI options

[walcht]

• add detailed Roslyn LS server and CLI options and their official sources (and how to find them from the official repository)

I think this is beneficial so that users get a somewhat up-to-date overview of the set of Roslyn LS settings + CLI options.

These settings were checked and verified against the latest version (as the time of writing this):
5.4.0-2.26160.4+9bfb100aebfde9d8cf551e76c0a60254be2077cf

This is still a draft PR - I need to verify all of the newly mentioned settings

[walcht]

I think this is ready now. I integrated the Roslyn LS settings into the Lua example (to avoid repetition). Not all settings are mentioned.

Fixed some typos.
Re-adjusted column width to 120 for the README file.
Links are referenced from the bottom of the README.

[seblyng]

Looks good otherwise

[tris203]

Should we prefer to gen this? Or atleast document how it's updated

This feels like it would get out of sync with the Roslyn repo and be bloat

It would also be nice to generate a type so we could have completion for settings

[seblyng]

Yeah that would be cool

[walcht]

@tris203 if by gen you mean autogenerating the lua settings + type (and docstring if available) then sure I can do that
(will push changes here then).

Just a question on where that should be implemented - E.g., .github/workflow/sync_roslyn_settings.yml?

This feels like it would get out of sync with the Roslyn repo and be bloat

Agree. Recently Roslyn LS added a lot of new settings and CLI options that I mostly don't understand.