fix: Omnisharp dynamic arguments are not escaped

[Marti2203]

Hi! I was experimenting a little with the library and saw that the arguments passed to Omnisharp are not escaped. This can cause problems for projects which contain whitespace in the path names, e.g. proj/a b/file name.sln.

Furthermore, I see this issue in other LSP invocation commands, can also add this to the PR if you want.