Unify `Arguments` parsing of exe:ghcide and exe:haskell-language-server

The cli argument parsing for `exe:ghcide` and `exe:haskell-language-server` are very similar but separate.
I think it would be better if we extracted out a common argument parser and use the same argument parser for ghcide and haskell-language-server.

This should be reasonably simple, it requires some extraction of `ghcide` types from `Arguments` so that it can be used in `exe:ghcide` and `exe:haskell-language-server` as well