feat: better hover

[daliusd]

Default maximumHoverLength value is 500. That means hover information is truncated for complicated types (usually some parts are omitted and shown as ...). This is a little bit annoying as it means you must go deeper into code and analyze type itself while all info could be in hover. This change solves this problem.

I have intentionally made this non configurable as I think this should be default in Neovim.